PHYSICAL REVIEW LETTERS 122, 151801 (2019) Search for the Production of a Long-Lived Neutral Particle Decaying withinpthe ffiffi ATLAS Hadronic Calorimeter in Association with a Z Boson from pp Collisions at s = 13 TeV M. Aaboud et al.* (ATLAS Collaboration) (Received 7 November 2018; published 15 April 2019) This Letter presents a search for the production of a long-lived neutral particle (Zd ) decaying within the ATLAS hadronic calorimeter, in association with a standard model (SM) Z boson produced via an intermediate scalar boson, where Z → lþ l− (l ¼ e, μ). The data used were collected by the ATLAS pffiffiffi detector during 2015 and 2016 pp collisions with a center-of-mass energy of s ¼ 13 TeV at the Large Hadron Collider and correspond to an integrated luminosity of 36.1  0.8 fb−1 . No significant excess of events is observed above the expected background. Limits on the production cross section of the scalar boson times its decay branching fraction into the long-lived neutral particle are derived as a function of the mass of the intermediate scalar boson, the mass of the long-lived neutral particle, and its cτ from a few centimeters to one hundred meters. In the case that the intermediate scalar boson is the SM Higgs boson, its decay branching fraction to a long-lived neutral particle with a cτ approximately between 0.1 and 7 m is excluded with a 95% confidence level up to 10% for mZd between 5 and 15 GeV. DOI: 10.1103/PhysRevLett.122.151801 Many extensions to the standard model (SM) such as an additional Uð1Þd dark gauge symmetry [16,17]. One supersymmetry [1,2], inelastic dark matter [3], and hidden such model has been tested by the ATLAS experiment in a valley scenarios [4,5] predict the existence of long-lived search for a new particle that is mediated by the Higgs neutral particles that can decay hadronically. Search for boson and decays promptly to a lepton pair [18,19]. This long-lived neutral particles is an emerging field of research analysis expands the search to a more general case to that has attracted significant theoretical and experimental include a possible new scalar (Φ) that couples to Z and Zd , interests. So far, only searches for the pair production of instead of only the Higgs boson, and considers the scenario such particles have been carried out by the ATLAS [6–9], in which the Zd decays hadronically with a cτ between a CMS [10,11], and LHCb [12,13] experiments at the Large few centimeters and 100 meters, where c is the speed of Hadron Collider (LHC), and the CDF [14], and D0 [15] light and τ is the Zd proper lifetime. pffiffiffi experiments at the Tevatron. The analysis uses data from s ¼ 13 TeV proton- This Letter reports a new way to look for new physics proton (pp) collisions at the LHC that were recorded by (NP) beyond the SM in a collider using singly produced the ATLAS detector in 2015 and 2016 with single-electron long-lived neutral particle, which is one potential scenario and single-muon triggers [20], corresponding to an inte- that NP can manifest itself but had never been considered grated luminosity of 36.1  0.8 fb−1 . The ATLAS detector in theories or experiments. Among many possible single [21] is a multipurpose particle detector with a cylindrical production final states, this Letter focuses on search for geometry [22]. Thepdistance between ffi two objects in the ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi a hadronically decaying long-lived neutral particle, η–ϕ space is ΔR ¼ ðΔηÞ2 þ ðΔϕÞ2 . Transverse momen- denoted by Zd hereafter, produced in association with a tum is defined by pT ¼ p sin θ. It consists of an inner SM Z boson through an intermediate scalar Φ or Higgs detector (ID) [23] surrounded by a solenoid that produces a boson, pp → Φ=H → ZZd , where Z → lþ l− (l ¼ e, μ). 2 T magnetic field, electromagnetic and hadronic calorim- Production of a new particle in association with a Z boson eters, and a muon spectrometer in a magnetic field is a popular scenario in hidden- or dark-sector models with produced by a system of toroid magnets. The ID measures the trajectories of charged particles over the full azimuthal angle and in a pseudorapidity range of jηj < 2.5 using * Full author list given at the end of the article. silicon pixel, silicon microstrip, and straw-tube transition- radiation tracker detectors. Liquid-argon electromagnetic Published by the American Physical Society under the terms of calorimeters (LArCal) extend from 1.5 to 2.0 m in radius the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to in the barrel and from 3.6 to 4.25 m in jzj in the end caps. the author(s) and the published article’s title, journal citation, A scintillator-tile calorimeter (TileCal) provides hadronic and DOI. Funded by SCOAP3. calorimetery and covers the region 2.25 < r < 4.25 m. 0031-9007=19=122(15)=151801(19) 151801-1 © 2019 CERN, for the ATLAS Collaboration PHYSICAL REVIEW LETTERS 122, 151801 (2019) The experimental signature searched for is the Zd decaying multiple pp interactions in the same and neighboring bunch within the TileCal, thus producing a jet that has little or no crossings (pileup) is included by overlaying minimum-bias energy deposited in the LArCal, and no charged tracks that events simulated with PYTHIA8.186 on each generated event point to the reconstructed location of the collision of in all samples. The generated samples were processed interest (hereafter called the primary vertex). through a GEANT4-based detector simulation [29,30] and Monte Carlo (MC) simulated events are used to optimize the standard ATLAS reconstruction software. the event selection and to help validate the analysis. Signal The selected events have a pair of oppositely charged and samples were generated using the PYTHIA 8.210 [24] isolated electrons [31] or muons [32] to form a Z boson generator with the NNPDF23LO parton distribution func- candidate. Electrons and muons are required to have jηj < tions (PDFs) [25] and the A14 set of tuned parameters (A14 2.47 and jηj < 2.4, respectively, and pT > 25 GeV tune) [26], with an assumption that the Zd decays only to (27 GeV) in data collected in 2015 (2016). The invariant the highest-mass heavy quark pair (bb̄ or cc̄) that is mass of the Z candidate (mll ) is required to be between 66 kinematically allowed. Nine samples were produced with and 116 GeV. Selected jets must have transverse energy three different Zd masses for each of three Φ masses ET > 40 GeV and jηj < 2.0 to ensure the jets are com- (mZd ¼ f5; 10; 15g; f10; 50; 100g, and f20; 100; 200g for pletely within the ID. They are reconstructed using the anti- mΦ ¼ 125, 250, and 500 GeV, respectively), where mΦ ¼ kt algorithm [33,34] with a radius parameter R ¼ 0.4 and 125 GeV corresponds to the SM Higgs boson. The cτ of calibrated to particle level [35]. Standard ATLAS jet- the Zd is a free parameter in this model. For each mass quality criteria [36] are applied, except the one for the hypothesis of Zd and Φ, its cτ is chosen to maximize the ratio of the energy deposited in the hadronic calorimeter to probability for Zd to decay inside the TileCal, which is the total energy since it removes signal jets. A jet is found to be around 20% for all samples, as shown in considered as a Zd candidate, referred to as a calorimeter- Fig. 1(a). The events were reweighted to produce samples ratio jet (CR jet) hereafter, if it satisfies log10 ðETile =ELAr Þ > with different cτðZd Þ [8] between 0.01 and 100 m. The 1.2 with no associated tracks [37] of pT > 1 GeV origi- dominant SM background arises from events with a Z nating from the primary vertex, where ETile and ELAr are the boson produced in association with jets (Z þ jets), where a jet energy deposited in the TileCal and LArCal, respec- jet mimics the experimental signature of Zd decay inside the tively [6], as shown in Fig. 1(b). Jets with ET < 60 GeV in TileCal due to the presence of long-lived SM particles (K 0L , the transition region between the barrel and end cap Λ, etc), out-of-time pileup (additional pp collisions occur- cryostats (1.0 < jηj < 1.3) are not considered as CR-jet ring in bunch-crossings just before and after the collision of candidates due to noise in the gap scintillator of the TileCal interest), noise, detector inefficiencies, and beam-induced [38]. In addition, the timing of the CR jet is required to be background. Additional SM background processes include between −3 and 15 ns in order to suppress jets arising from the production of top quarks and W þ jets. The SM back- out-of-time pileup and beam-induced backgrounds [6]. The ground MC samples are generated with the configurations timing of a jet is obtained from its constituent calorimeter described in Ref. [27] for W þ jets and Z þ jets production, cells by calculating an average time over cells weighted by and Ref. [28] for tt̄ and single top production. The effect of cell energy squared where the cell time is measured (a) 0.25 (b) 107 ATLAS (c) 0.18 (m ,mZ ) [GeV] s=13 TeV, 36.1 fb-1 ATLAS Fraction of Zd Decays in HCal Φ ATLAS Simulation 6 d 10 0.16 125,10 Data s=13 TeV, 36.1 fb-1 Number of Jets 0.2 10 5 W → μ ν 0.14 250,50 Fraction of Jets top 500,20 104 0.12 Z+jets 0.15 500,200 Other MC 103 0.1 102 0.08 0.1 10 0.06 W± → e± ν 0.05 1 0.04 W± → μ± ν 3 Data/MC 0.02 - 2 Z → l l+ 0 1 0 10 −2 10 −1 1 10 10 2 0 0 1 2 3 4 5 6 7 8 9 −1 0 1 2 3 4 5 c τ [m] Jet Track Multiplicity log (E /ELAr) 10 Tile FIG. 1. (a) The probability of a Zd boson to decay within the TileCal as a function of the cτ for each choice of mΦ and mZd . As mZd increases (for a fixed mΦ ) the Zd becomes less boosted and therefore travels less distance into the detector before decaying. (b) The distributions of log10 ðETile =ELAr Þ for jets in background and signal MC simulations [see legend of Fig. 1(a) for signal labels] and W þ jets data (prior to any requirements on the track multiplicity of jets or jet timing). The threshold for this variable is shown as a solid black line. (c) The distributions of the track multiplicity for jets prior to the selection of CR jets in the W þ jets and Z þ jets data samples. 151801-2 PHYSICAL REVIEW LETTERS 122, 151801 (2019) according to the bunch crossing clock, relative to the Studies [6] have shown that jets originating from quarks expected time of flight from the bunch crossing to the cell and gluons may have different probabilities of satisfying [39]. After this selection, the number of selected events the selection criteria for CR jets. MC simulations predict containing a CR jet with an ET above a chosen threshold is that jets from W þ jets and Z þ jets production are mostly compared with the predicted total number of background initiated by quarks with a similar fraction (∼73%). events. The minimum ET requirement of the selected CR However, W þ jets data samples are contaminated with a jets is further optimized to achieve the highest experimental significant fraction of SM multijet events with a misiden- sensitivity for each mass hypothesis [40]. It is set to be tified lepton, which is estimated to be approximately 2% in 40 GeV for mΦ ¼ 125 GeV samples, 60 GeV for mΦ ¼ the muon final state and 17% in the electron final state 250 GeV samples, and 80 GeV for mΦ ¼ 500 GeV samples. using background-enriched control samples [41]. SM The signal efficiency times acceptance (ϵ × A) is defined multijets originate primarily from gluons and thus intro- as the ratio of the number of selected signal events in MC duce a difference between the W þ jets and Z þ jets simulations to the number of generated signal events. It is a samples. The distributions of the track multiplicity of a function of mΦ , mZd , and the cτðZd Þ. The maximum values jet in the W þ jets and Z þ jets samples, which are vary between approximately 1% for lowest mΦ samples to sensitive to the quark/gluon jet fraction [42], show a 5–7% for samples with larger Φ mass. The main loss is due significant difference for track multiplicities of 0 and 1 to the low probability that Zd decays inside the TileCal, as in Fig. 1(c). As a result, the f CR values measured in the shown in Fig. 1(a). The samples for mΦ ¼ 125 GeV suffer muon final state are used for the central value of the further efficiency loss due to the jet ET requirement. background estimate, while the f CR values measured in MC simulations are not reliable enough to estimate the the electron final state are used as a cross-check to assign backgrounds of this analysis, as illustrated by the right- a systematic uncertainty due to different quark or gluon hand side of Fig. 1(b). A data-driven approach is thus used jet fractions in the W þ jets and Z þ jets samples. The for its estimation. A control data sample of SM W þ jets measured probabilities, f CR , are found to be dependent on events, with the same event selection criteria of W → the jet multiplicity in the event. Studies show that this is lνðl ¼ e; μÞ in Ref. [41], is used to derive the probability caused by the presence of jets from pileup interactions for a jet to pass the selection of the CR jet, assuming that which deposit additional energy in the LArCal, suppressing the Zd cannot be produced in association with a W boson. the signature of CR jets. The jet multiplicity and pileup The probability is calculated as f CR ¼ N CRjet =N jet in bins distributions of events in the W þ jets sample are the same of the jet ET and η, where N CRjet is the number of jets that as those from the Z þ jets sample, and therefore the satisfy the CR-jet selection criteria and N jet is the total parametrization of the measured f CR as a function of jet number of jets from the W þ jets sample in each bin, as multiplicity or pileup is not necessary. summarized in Table I. For a selected event in data Several studies were performed to validate the back- containing a Z → ll candidate and N jets, the correspond- ground estimation procedure. A Z þ jets sideband is formed ing probability for from events satisfying all signal selection criteria except the Q it to be identified as a signal event is invariant-mass requirement for the Z candidate. The mass is therefore P¼1− i∈N ½1−f CR ðET ;η Þ, where f CR ðET i ; ηi Þ i i is the probability of the ith jet in the event to satisfy the CR- required to be 30 < mll < 55 GeV. The events in the jet selection criteria. The sum of the probabilities P for all higher mass sideband mll > 116 GeV are not used as they the selected events is therefore the expected number of are still dominated by Z þ jets production, as indicated by background events. Potential signal contamination of this background MC simulations [43]. Based on the measured control region was estimated using MC and found to have a CR-jet probability in W þ jets, the expected numbers of <1% impact on the background estimate. background events with ET of CR-jets greater than 40, 60, and 80 GeV are estimated to be 2.2  0.2, 0.7  0.1, and 0.3  0.1, where the uncertainties are statistical only. They are consistent with the corresponding observations in data, TABLE I. The numbers of jets satisfying different requirements which have 1, 1, and 0 events, respectively. on minimum jet ET and their corresponding averaged CR-jet The background estimation method relies on an selection probabilities in the W → lν samples. assumption that jets in the W þ jets sample have the same Minimum jet ET 40 GeV 60 GeV 80 GeV characteristics as jets in the Z þ jets sample. This assumption is tested using validation jets that are defined N CRjet ðW → eνÞ 982 189 63 to satisfy the selection criteria of the CR jets except the N CRjet ðW → μνÞ 1030 186 71 zero-ghost-track requirement. Validation jets must have N jet ðW → eνÞ 3.3 × 107 1.5 × 107 0.8 × 107 more than two associated tracks to avoid signal contami- N jet ðW → μνÞ 3.1 × 107 1.3 × 107 0.7 × 107 nation, as MC-simulated signal events show that less than fCR ðW → eνÞ 3.0 × 10−5 1.3 × 10−5 7.9 × 10−6 1% of jets from Zd decays inside the TileCal have more fCR ðW → μνÞ 3.3 × 10−5 1.4 × 10−5 9.7 × 10−6 than two tracks. The probability for a jet to be identified as 151801-3 PHYSICAL REVIEW LETTERS 122, 151801 (2019) TABLE II. Event yields for the predicted backgrounds and data, generated MC simulations to the data are typically small and the expected and observed ULs on the signal yields at the (<5%) except for the samples with mΦ ¼ 125 GeV 95% C.L. The quoted errors include both the statistical and (∼13%), in which case the Zd have small energies and systematic uncertainties. additional energy deposition in the LArCal from pileup can significantly affect their selection efficiencies. Since the Minimum jet ET 40 GeV 60 GeV 80 GeV CR jets in this analysis have a very small fraction of their Background 175  22 33.0  4.4 13.2  3.5 energies inside the LArCal, the in situ jet energy intercali- Data 158 35 16 bration [6,35] is repeated using the pT balance method in Expected UL 65 17 10 dijets events, and the observed difference between the data Observed UL 50 18 13 and MC simulation is used to derive an additional sys- tematic uncertainty of the jet energy scale. The correspond- ing effect on the signal efficiencies is approximately 5–9% a validation jet is measured in the W þ jets sample as a for samples with mΦ ¼ 125 GeV, and negligible for function of jet ET and η and subsequently used to predict samples with higher mΦ values. The effects on the signal the number of events containing a Z → ll candidate and at efficiency and acceptance due to theoretical uncertainties, least one validation jet. As a result, a global scale factor of such as a PDF choice and initial- and final-state radiation 1.24, which is defined as the observed number of events modeling, are found to be very small (<1%). with validation jets divided by the predicted value, is Table II shows the predicted numbers of background applied to the measured probabilities f CR . A 50% relative events and the observed data events with different mini- correction of the scale factor (0.12) is assigned as a mum ET requirements for the selected CR jets. The data are systematic uncertainty due to potential bias of the back- well described by the background estimate. In the absence ground estimation procedure. of any significant data excess, upper limits (ULs) on the The systematic uncertainties of the background estima- signal yield of pp → Φ → ZZd at the 95% confidence level tion include the statistical uncertainty from the W þ jets (C.L.) are derived using the C:L:s method [40] taking into sample (2–8%), potential difference in the quark or gluon account both the statistical and systematic uncertainties. jet fractions between the W þ jets and Z þ jets samples (7– The results are listed in Table II. 20%), and the scale factor uncertainty (∼10%) measured The results are further reinterpreted as the UL on the using the validation jets. The uncertainty of the integrated production cross section of Φ times the decay branching luminosity is 2.1% [44,45]. Uncertainties resulting from fraction BðΦ → ZZd Þ, as a function of mΦ , mZd , and cτ detector effects such as the trigger efficiencies, the energy of the Zd . In the case of the SM Higgs boson, where scale and resolution of jets [35], lepton identification, mH ¼ 125 GeV, the UL on BðH → ZZd Þ are evaluated reconstruction and isolation efficiencies, lepton momentum using the SM Higgs boson cross section σ SM ¼ 48.5þ4.6−6.7 pb scales, and resolutions [31,32,46] only affect the calcu- [47] of the gluon-gluon fusion process; other production lation of the selection efficiencies of Zd signal events, since modes are ignored. The results, reweighted to other cτ [8], the background is estimated from the data. They are are shown in Fig. 2. typically small (<1–5%). Pileup adds extra tracks and In conclusion, this Letter reports a novel search for a electromagnetic energy to jets. The systematic uncertainties singly produced long-lived neutral particle Zd , in associ- associated with reweighting the pileup distribution from the ation with an SM Z boson via coupling to an intermediate (a) (b) (c) 1 10 3 10 3 ATLAS ATLAS σ ( pp → Φ ) × B (Φ → Z Z ) [pb] σ ( pp → Φ ) × B (Φ → Z Z ) [pb] s=13 TeV, 36.1 fb-1 s=13 TeV, 36.1 fb-1 95% C.L.s Limits 95% C.L.s Limits 10 2 10 2 d d m Φ = 250 GeV m Φ = 500 GeV −1 mZd = 10 GeV mZd = 20 GeV B (H → Z Zd ) 10 mZd = 50 GeV mZd = 100 GeV 10 mZd = 100 GeV 10 mZd = 200 GeV 1 1 10 −2 mH = 125 GeV ATLAS mZ = 5 GeV d 10 −1 10 −1 s=13 TeV, 36.1 fb-1 mZd = 10 GeV 95% C.L.s Limits mZd = 15 GeV 10 −3 −2 10 −2 −2 10 −2 −2 10 10 −1 1 10 10 2 10 10 −1 1 10 10 2 10 10 −1 1 10 10 2 c τ [m] c τ [m] c τ [m] FIG. 2. (a) Observed 95% C.L. limits on the decay branching fraction of BðH → ZZd Þ for the SM Higgs boson as a function of the cτðZd Þ. (b) and (c) Observed 95% C.L. limits on the production cross section (σ) of Φ times its decay branching fraction to ZZd as a function of the cτðZd Þ. 151801-4 PHYSICAL REVIEW LETTERS 122, 151801 (2019) −1 ffiffiffi analysis is based on 36.1  0.8 fb of pp scalar boson.pThe [1] S. Dimopoulos, M. Dine, S. Raby, and S. D. Thomas, collisions at s ¼ 13 TeV collected in 2015 and 2016 with Experimental Signatures of Low Energy Gauge-Mediated the ATLAS detector at the LHC. No excess over the expected Supersymmetry Breaking, Phys. Rev. Lett. 76, 3494 (1996). background was observed. Upper limits on the production [2] R. Barbier et al., R-parity violating supersymmetry, Phys. cross section of the scalar boson times its branching fraction Rep. 420, 1 (2005). to the long-lived neutral particle at 95% C.L. are derived as a [3] D. Smith and N. Weiner, Inelastic dark matter, Phys. Rev. D function of the particle proper lifetimes for different masses 64, 043502 (2001). of the scalar boson and the Zd . In the case that the [4] M. J. Strassler and K. M. Zurek, Echoes of a hidden valley at intermediate scalar boson is the SM Higgs boson, its decay hadron colliders, Phys. Lett. B 651, 374 (2007). branching fraction to a long-lived neutral particle with a cτ [5] M. J. Strassler and K. M. Zurek, Discovering the Higgs approximately between 0.1 and 7 m is excluded with a through highly-displaced vertices, Phys. Lett. B 661, 263 95% C.L. up to 10% for mZd between 5 and 15 GeV. (2008). [6] ATLAS Collaboration, Search for pair-produced long-lived We thank CERN for the very successful operation of the neutral particles decaying to jets pffiffiffiin the ATLAS hadronic LHC, as well as the support staff from our institutions calorimeter in pp collisions at s ¼ 8 TeV, Phys. Lett. B without whom ATLAS could not be operated efficiently. 743, 15 (2015). We acknowledge the support of ANPCyT, Argentina; [7] ATLAS Collaboration, Search for long-lived, weakly inter- YerPhI, Armenia; ARC, Australia; BMWFW and FWF, acting particles that decay p toffiffiffi displaced hadronic jets in proton–proton collisions at s ¼ 8 TeV with the ATLAS Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and detector, Phys. Rev. D 92, 012010 (2015). FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; [8] ATLAS Collaboration, Search for massive, long-lived par- CONICYT, Chile; CAS, MOST, and NSFC, China; ticles using multitrack displaced COLCIENCIAS, Colombia; MSMT CR, MPO CR, and pffiffiffi vertices or displaced lepton pairs in pp collisions at s ¼ 8 TeV with the ATLAS VSC CR, Czech Republic; DNRF and DNSRC, Denmark; detector, Phys. Rev. D 92, 072004 (2015). IN2P3-CNRS, CEA-DRF/IRFU, France; SRNSFG, [9] ATLAS Collaboration, Search for long-lived, massive par- Georgia; BMBF, HGF, and MPG, Germany; GSRT, ticles in events with pdisplaced ffiffiffi vertices and missing trans- Greece; RGC, Hong Kong SAR, China; ISF and verse momentum in s ¼ 13 TeV pp collisions with the Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, ATLAS detector, Phys. Rev. D 97, 052012 (2018). Japan; CNRST, Morocco; NWO, Netherlands; RCN, [10] CMS Collaboration, Search for long-lived neutral particles Norway; MNiSW and NCN, Poland; FCT, Portugal; decayingptoffiffiffi quark–antiquark pairs in proton–proton colli- sions at s ¼ 8 TeV, Phys. Rev. D 91, 012007 (2015). MNE/IFA, Romania; MES of Russia and NRC KI, [11] CMS Collaboration, Search for new long-lived particles at Russian Federation; JINR; MESTD, Serbia; MSSR, pffiffiffi s ¼ 13 TeV, Phys. Lett. B 780, 432 (2018). Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South [12] LHCb Collaboration, Search for long-lived particles Africa; MINECO, Spain; SRC and Wallenberg Foundation, decaying to jet pairs, Eur. Phys. J. C 75, 152 (2015). Sweden; SERI, SNSF and Cantons of Bern and Geneva, [13] LHCb Collaboration, Search for massive long-lived par- Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, ticles decaying semileptonically in the LHCb detector, Eur. United Kingdom; DOE and NSF, United States of Phys. J. C 77, 224 (2017). America. In addition, individual groups and members have [14] CDF Collaboration, Search for heavy metastable pffiffiffi particles received support from BCKDF, CANARIE, CRC, and decaying to jet pairs in pp̄ collisions at s ¼ 1.96 TeV, Compute Canada, Canada; COST, ERC, ERDF, Horizon Phys. Rev. D 85, 012007 (2012). 2020, and Marie Skłodowska-Curie Actions, European [15] D0 Collaboration, Search for Resonant Pair Production of Neutral Long-Lived Particles Decaying to bb̄ in pp̄ Colli- Union; Investissements d’ Avenir Labex and Idex, ANR, pffiffiffi sions at s ¼ 1.96 TeV, Phys. Rev. Lett. 103, 071801 France; DFG and AvH Foundation, Germany; Herakleitos, (2009). Thales, and Aristeia programmes co-financed by EU-ESF [16] H. Davoudiasl, H.-S. Lee, and W. J. Marciano, “Dark” Z and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; implications for parity violation, rare meson decays, and CERCA Programme Generalitat de Catalunya, Spain; The Higgs physics, Phys. Rev. D 85, 115019 (2012). Royal Society and Leverhulme Trust, United Kingdom. [17] H. Davoudiasl, H.-S. Lee, I. Lewis, and W. J. Marciano, The crucial computing support from all WLCG partners is Higgs decays as a window into the dark sector, Phys. Rev. D acknowledged gratefully, in particular from CERN, the 88, 015022 (2013). ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF [18] ATLAS Collaboration, Search for new light gauge bosons in (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/ Higgs boson decays to four-lepton final states in pp pffiffiffi GridKA (Germany), INFN-CNAF (Italy), NL-T1 collisions at s ¼ 8 TeV with the ATLAS detector at the (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK), LHC, Phys. Rev. D 92, 092001 (2015). [19] ATLAS Collaboration, Search for Higgs boson decays to and BNL (USA), the Tier-2 facilities worldwide and large beyond-the-Standard-Model light bosons pffiffiffi in four-lepton non-WLCG resource providers. Major contributors of events with the ATLAS detector at s ¼ 13 TeV, J. High computing resources are listed in Ref. [48]. Energy Phys. 06 (2018) 166. 151801-5 PHYSICAL REVIEW LETTERS 122, 151801 (2019) [20] ATLAS Collaboration, Performance of the ATLAS trigger [35] ATLAS Collaboration, Jet energy scale measurements and system in 2015, Eur. Phys. J. C 77, 317 (2017). their pffiffiffi systematic uncertainties in proton–proton collisions at [21] ATLAS Collaboration, The ATLAS experiment at the s ¼ 13 TeV with the ATLAS detector, Phys. Rev. D 96, CERN large hadron collider, J. Instrum. 3, S08003 (2008). 072002 (2017). [22] ATLAS uses a right-handed coordinate system with its [36] ATLAS Collaboration, Selection of jets produced in 13 TeV origin at the nominal interaction point (IP) in the center of proton–proton collisions with the ATLAS detector, CERN, the detector and the z axis along the beam pipe. The x axis Report No. ATLAS-CONF-2015-029, 2015, https://cds points to the center of the LHC ring, and the y axis points .cern.ch/record/2037702. upward. Cylindrical coordinates ðr; ϕÞ are used in the [37] M. Cacciari and G. P. Salam, Pileup subtraction using jet transverse plane, ϕ being the azimuthal angle around the areas, Phys. Lett. B 659, 119 (2008). z axis. The pseudorapidity is defined in terms of the polar [38] ATLAS Collaboration, Search for long-lived neutral par- angle θ as η ¼ − ln tanðθ=2Þ. ticles decayingpinto ffiffiffi displaced lepton-jets in proton–proton [23] B. Abbott et al., Production and Integration of the ATLAS collisions at s ¼ 13 TeV with the ATLAS detector, insertable B-layer, J. Instrum. 13, T05008 (2018). CERN Report No. ATLAS-CONF-2016-042, 2016, [24] T. Sjöstrand, S. Ask, J. R. Christiansen, R. Corke, N. Desai, https://cds.cern.ch/record/2206083. P. Ilten, S. Mrenna, S. Prestel, C. O. Rasmussen, and P. Z. [39] ATLAS Collaboration, Topological cell clustering in the Skands, An introduction to PYTHIA 8.2, Comput. Phys. ATLAS calorimeters and its performance in LHC Run 1, Commun. 191, 159 (2015). Eur. Phys. J. C 77, 490 (2017). [25] R. D. Ball et al., Parton distributions for the LHC Run II, [40] A. L. Read, Presentation of search results: The CLs tech- J. High Energy Phys. 04 (2015) 040. nique, J. Phys. G 28, 2693 (2002). [26] ATLAS Collaboration, ATLAS Pythia 8 tunes to 7 TeV data [41] ATLAS Collaboration, Measurement of W pand ffiffiffi Z-boson CERN Report No. ATL-PHYS-PUB-2014-021, 2014, production cross sections in pp collisions at s ¼ 13 TeV https://cds.cern.ch/record/1966419. with the ATLAS detector, Phys. Lett. B 759, 601 (2016). [27] ATLAS Collaboration, Monte Carlo generators for the [42] ATLAS Collaboration, Quark versus gluon jet tagging using production of a W or Z=γ  Boson in association with jets charged-particle constituent multiplicity with the ATLAS at ATLAS in Run 2, CERN Report No. ATL-PHYS-PUB- detector, CERN Report No. ATL-PHYS-PUB-2017-009, 2016-003, 2016, https://cds.cern.ch/record/2120133. 2017, https://cds.cern.ch/record/2263679. [28] ATLAS Collaboration, Simulationpffiffiffi of top-quark production [43] ATLAS Collaboration, Measurement of the Drell–Yan for the ATLAS experiment at s ¼ 13 TeV, CERN Report triple-differential pffiffiffi cross section in pp collisions at No. ATL-PHYS-PUB-2016-004, 2016, https://cds.cern.ch/ s ¼ 8 TeV, J. High Energy Phys. 12 (2017) 059. record/2120417. [44] ATLAS Collaboration, pffiffiffi Luminosity determination in pp [29] S. Agostinelli et al., GEANT4–A simulation toolkit, Nucl. collisions at s ¼ 8 TeV using the ATLAS detector at Instrum. Methods Phys. Res., Sect. A 506, 250 (2003). the LHC, Eur. Phys. J. C 76, 653 (2016). [30] ATLAS Collaboration, The ATLAS simulation infrastruc- [45] G. Avoni et al., The new LUCID-2 detector for luminosity ture, Eur. Phys. J. C 70, 823 (2010). measurement and monitoring in ATLAS, J. Instrum. 13, [31] ATLAS Collaboration, Electron efficiency measurements P07017 (2018). with the ATLAS detector using the 2015 LHC proton– [46] ATLAS Collaboration, Electron and photon energy calibra- proton collision data, CERN Report No. ATLAS-CONF- tion pffiffiffi with the ATLAS detector using data collected in 2015 at 2016-024, 2016, https://cds.cern.ch/record/2157687. s ¼ 13 TeV, CERN Report No. ATL-PHYS-PUB-2016- [32] ATLAS Collaboration, Muon reconstruction performance of 015, 2016, https://cds.cern.ch/record/2203514. the pffiffiffi ATLAS detector in proton–proton collision data at [47] D. de Florian et al., Handbook of LHC Higgs cross sections: s ¼ 13 TeV, Eur. Phys. J. C 76, 292 (2016). 4. Deciphering the Nature of the Higgs sector, arXiv: [33] M. Cacciari, G. P. Salam, and G. Soyez, The anti-kt jet 1610.07922. clustering algorithm, J. High Energy Phys. 04 (2008) 063. [48] ATLAS Collaboration, ATLAS computing acknowledge- [34] M. Cacciari, G. P. Salam, and G. Soyez, FastJet user manual, ments, CERN Report No. ATL-GEN-PUB-2016-002, 2016, Eur. Phys. J. C 72, 1896 (2012). https://cds.cern.ch/record/2202407. M. Aaboud,34d G. Aad,99 B. Abbott,125 O. Abdinov,13,a B. Abeloos,129 D. K. Abhayasinghe,91 S. H. Abidi,164 O. S. AbouZeid,39 N. L. Abraham,153 H. Abramowicz,158 H. Abreu,157 Y. Abulaiti,6 B. S. Acharya,64a,64b,b S. Adachi,160 L. Adam,97 L. Adamczyk,81a J. Adelman,119 M. Adersberger,112 A. Adiguzel,12c,c T. Adye,141 A. A. Affolder,143 Y. Afik,157 C. Agheorghiesei,27c J. A. Aguilar-Saavedra,137f,137a,d F. Ahmadov,77,e G. Aielli,71a,71b S. Akatsuka,83 T. P. A. Åkesson,94 E. Akilli,52 A. V. Akimov,108 G. L. Alberghi,23b,23a J. Albert,173 P. Albicocco,49 M. J. Alconada Verzini,86 S. Alderweireldt,117 M. Aleksa,35 I. N. Aleksandrov,77 C. Alexa,27b D. Alexandre,19 T. Alexopoulos,10 M. Alhroob,125 B. Ali,139 G. Alimonti,66a J. Alison,36 S. P. Alkire,145 C. Allaire,129 B. M. M. Allbrooke,153 B. W. Allen,128 P. P. Allport,21 A. Aloisio,67a,67b A. Alonso,39 F. Alonso,86 C. Alpigiani,145 A. A. Alshehri,55 M. I. Alstaty,99 B. Alvarez Gonzalez,35 151801-6 PHYSICAL REVIEW LETTERS 122, 151801 (2019) D. Álvarez Piqueras,171 M. G. Alviggi,67a,67b B. T. Amadio,18 Y. Amaral Coutinho,78b A. Ambler,101 L. Ambroz,132 C. Amelung,26 D. Amidei,103 S. P. Amor Dos Santos,137a,137c S. Amoroso,44 C. S. Amrouche,52 F. An,76 C. Anastopoulos,146 L. S. Ancu,52 N. Andari,142 T. Andeen,11 C. F. Anders,59b J. K. Anders,20 K. J. Anderson,36 A. Andreazza,66a,66b V. Andrei,59a C. R. Anelli,173 S. Angelidakis,37 I. Angelozzi,118 A. Angerami,38 A. V. Anisenkov,120b,120a A. Annovi,69a C. Antel,59a M. T. Anthony,146 M. Antonelli,49 D. J. A. Antrim,168 F. Anulli,70a M. Aoki,79 J. A. Aparisi Pozo,171 L. Aperio Bella,35 G. Arabidze,104 J. P. Araque,137a V. Araujo Ferraz,78b R. Araujo Pereira,78b A. T. H. Arce,47 R. E. Ardell,91 F. A. Arduh,86 J-F. Arguin,107 S. Argyropoulos,75 J.-H. Arling,44 A. J. Armbruster,35 L. J. Armitage,90 A. Armstrong,168 O. Arnaez,164 H. Arnold,118 M. Arratia,31 O. Arslan,24 A. Artamonov,109,a G. Artoni,132 S. Artz,97 S. Asai,160 N. Asbah,57 E. M. Asimakopoulou,169 L. Asquith,153 K. Assamagan,29 R. Astalos,28a R. J. Atkin,32a M. Atkinson,170 N. B. Atlay,148 K. Augsten,139 G. Avolio,35 R. Avramidou,58a M. K. Ayoub,15a A. M. Azoulay,165b G. Azuelos,107,f A. E. Baas,59a M. J. Baca,21 H. Bachacou,142 K. Bachas,65a,65b M. Backes,132 P. Bagnaia,70a,70b M. Bahmani,82 H. Bahrasemani,149 A. J. Bailey,171 V. R. Bailey,170 J. T. Baines,141 M. Bajic,39 C. Bakalis,10 O. K. Baker,180 P. J. Bakker,118 D. Bakshi Gupta,8 S. Balaji,154 E. M. Baldin,120b,120a P. Balek,177 F. Balli,142 W. K. Balunas,134 J. Balz,97 E. Banas,82 A. Bandyopadhyay,24 S. Banerjee,178,g A. A. E. Bannoura,179 L. Barak,158 W. M. Barbe,37 E. L. Barberio,102 D. Barberis,53b,53a M. Barbero,99 T. Barillari,113 M-S. Barisits,35 J. Barkeloo,128 T. Barklow,150 R. Barnea,157 S. L. Barnes,58c B. M. Barnett,141 R. M. Barnett,18 Z. Barnovska-Blenessy,58a A. Baroncelli,72a G. Barone,29 A. J. Barr,132 L. Barranco Navarro,171 F. Barreiro,96 J. Barreiro Guimarães da Costa,15a R. Bartoldus,150 A. E. Barton,87 P. Bartos,28a A. Basalaev,135 A. Bassalat,129 R. L. Bates,55 S. J. Batista,164 S. Batlamous,34e J. R. Batley,31 M. Battaglia,143 M. Bauce,70a,70b F. Bauer,142 K. T. Bauer,168 H. S. Bawa,150,h J. B. Beacham,123 T. Beau,133 P. H. Beauchemin,167 P. Bechtle,24 H. C. Beck,51 H. P. Beck,20,i K. Becker,50 M. Becker,97 C. Becot,44 A. Beddall,12d A. J. Beddall,12a V. A. Bednyakov,77 M. Bedognetti,118 C. P. Bee,152 T. A. Beermann,74 M. Begalli,78b M. Begel,29 A. Behera,152 J. K. Behr,44 F. Beisiegel,24 A. S. Bell,92 G. Bella,158 L. Bellagamba,23b A. Bellerive,33 M. Bellomo,157 P. Bellos,9 K. Belotskiy,110 N. L. Belyaev,110 O. Benary,158,a D. Benchekroun,34a M. Bender,112 N. Benekos,10 Y. Benhammou,158 E. Benhar Noccioli,180 J. Benitez,75 D. P. Benjamin,6 M. Benoit,52 J. R. Bensinger,26 S. Bentvelsen,118 L. Beresford,132 M. Beretta,49 D. Berge,44 E. Bergeaas Kuutmann,169 N. Berger,5 B. Bergmann,139 L. J. Bergsten,26 J. Beringer,18 S. Berlendis,7 N. R. Bernard,100 G. Bernardi,133 C. Bernius,150 F. U. Bernlochner,24 T. Berry,91 P. Berta,97 C. Bertella,15a G. Bertoli,43a,43b I. A. Bertram,87 G. J. Besjes,39 O. Bessidskaia Bylund,179 M. Bessner,44 N. Besson,142 A. Bethani,98 S. Bethke,113 A. Betti,24 A. J. Bevan,90 J. Beyer,113 R. Bi,136 R. M. Bianchi,136 O. Biebel,112 D. Biedermann,19 R. Bielski,35 K. Bierwagen,97 N. V. Biesuz,69a,69b M. Biglietti,72a T. R. V. Billoud,107 M. Bindi,51 A. Bingul,12d C. Bini,70a,70b S. Biondi,23b,23a M. Birman,177 T. Bisanz,51 J. P. Biswal,158 C. Bittrich,46 D. M. Bjergaard,47 J. E. Black,150 K. M. Black,25 T. Blazek,28a I. Bloch,44 C. Blocker,26 A. Blue,55 U. Blumenschein,90 S. Blunier,144a G. J. Bobbink,118 V. S. Bobrovnikov,120b,120a S. S. Bocchetta,94 A. Bocci,47 D. Boerner,179 D. Bogavac,112 A. G. Bogdanchikov,120b,120a C. Bohm,43a V. Boisvert,91 P. Bokan,169 T. Bold,81a A. S. Boldyrev,111 A. E. Bolz,59b M. Bomben,133 M. Bona,90 J. S. Bonilla,128 M. Boonekamp,142 H. M. Borecka-Bielska,88 A. Borisov,121 G. Borissov,87 J. Bortfeldt,35 D. Bortoletto,132 V. Bortolotto,71a,71b D. Boscherini,23b M. Bosman,14 J. D. Bossio Sola,30 K. Bouaouda,34a J. Boudreau,136 E. V. Bouhova-Thacker,87 D. Boumediene,37 C. Bourdarios,129 S. K. Boutle,55 A. Boveia,123 J. Boyd,35 D. Boye,32b I. R. Boyko,77 A. J. Bozson,91 J. Bracinik,21 N. Brahimi,99 A. Brandt,8 G. Brandt,179 O. Brandt,59a F. Braren,44 U. Bratzler,161 B. Brau,100 J. E. Brau,128 W. D. Breaden Madden,55 K. Brendlinger,44 L. Brenner,44 R. Brenner,169 S. Bressler,177 B. Brickwedde,97 D. L. Briglin,21 D. Britton,55 D. Britzger,113 I. Brock,24 R. Brock,104 G. Brooijmans,38 T. Brooks,91 W. K. Brooks,144b E. Brost,119 J. H Broughton,21 P. A. Bruckman de Renstrom,82 D. Bruncko,28b A. Bruni,23b G. Bruni,23b L. S. Bruni,118 S. Bruno,71a,71b B. H. Brunt,31 M. Bruschi,23b N. Bruscino,136 P. Bryant,36 L. Bryngemark,94 T. Buanes,17 Q. Buat,35 P. Buchholz,148 A. G. Buckley,55 I. A. Budagov,77 M. K. Bugge,131 F. Bührer,50 O. Bulekov,110 D. Bullock,8 T. J. Burch,119 S. Burdin,88 C. D. Burgard,118 A. M. Burger,5 B. Burghgrave,119 K. Burka,82 S. Burke,141 I. Burmeister,45 J. T. P. Burr,132 V. Büscher,97 E. Buschmann,51 P. Bussey,55 J. M. Butler,25 C. M. Buttar,55 J. M. Butterworth,92 P. Butti,35 W. Buttinger,35 A. Buzatu,155 A. R. Buzykaev,120b,120a G. Cabras,23b,23a S. Cabrera Urbán,171 D. Caforio,139 H. Cai,170 V. M. M. Cairo,2 O. Cakir,4a N. Calace,52 P. Calafiura,18 A. Calandri,99 G. Calderini,133 P. Calfayan,63 G. Callea,55 L. P. Caloba,78b S. Calvente Lopez,96 D. Calvet,37 S. Calvet,37 T. P. Calvet,152 M. Calvetti,69a,69b R. Camacho Toro,133 S. Camarda,35 D. Camarero Munoz,96 P. Camarri,71a,71b D. Cameron,131 R. Caminal Armadans,100 C. Camincher,35 S. Campana,35 M. Campanelli,92 A. Camplani,39 A. Campoverde,148 V. Canale,67a,67b M. Cano Bret,58c J. Cantero,126 T. Cao,158 Y. Cao,170 M. D. M. Capeans Garrido,35 I. Caprini,27b 151801-7 PHYSICAL REVIEW LETTERS 122, 151801 (2019) M. Caprini,27b M. Capua,40b,40a R. M. Carbone,38 R. Cardarelli,71a F. C. Cardillo,146 I. Carli,140 T. Carli,35 G. Carlino,67a B. T. Carlson,136 L. Carminati,66a,66b R. M. D. Carney,43a,43b S. Caron,117 E. Carquin,144b S. Carrá,66a,66b J. W. S. Carter,164 D. Casadei,32b M. P. Casado,14,j A. F. Casha,164 D. W. Casper,168 R. Castelijn,118 F. L. Castillo,171 V. Castillo Gimenez,171 N. F. Castro,137a,137e A. Catinaccio,35 J. R. Catmore,131 A. Cattai,35 J. Caudron,24 V. Cavaliere,29 E. Cavallaro,14 D. Cavalli,66a M. Cavalli-Sforza,14 V. Cavasinni,69a,69b E. Celebi,12b F. Ceradini,72a,72b L. Cerda Alberich,171 A. S. Cerqueira,78a A. Cerri,153 L. Cerrito,71a,71b F. Cerutti,18 A. Cervelli,23b,23a S. A. Cetin,12b A. Chafaq,34a D. Chakraborty,119 S. K. Chan,57 W. S. Chan,118 J. D. Chapman,31 B. Chargeishvili,156b D. G. Charlton,21 C. C. Chau,33 C. A. Chavez Barajas,153 S. Che,123 A. Chegwidden,104 S. Chekanov,6 S. V. Chekulaev,165a G. A. Chelkov,77,k M. A. Chelstowska,35 C. Chen,58a C. H. Chen,76 H. Chen,29 J. Chen,58a J. Chen,38 S. Chen,134 S. J. Chen,15c X. Chen,15b,l Y. Chen,80 Y-H. Chen,44 H. C. Cheng,61a H. J. Cheng,15d A. Cheplakov,77 E. Cheremushkina,121 R. Cherkaoui El Moursli,34e E. Cheu,7 K. Cheung,62 T. J. A. Chevalérias,142 L. Chevalier,142 V. Chiarella,49 G. Chiarelli,69a G. Chiodini,65a A. S. Chisholm,35,21 A. Chitan,27b I. Chiu,160 Y. H. Chiu,173 M. V. Chizhov,77 K. Choi,63 A. R. Chomont,129 S. Chouridou,159 Y. S. Chow,118 V. Christodoulou,92 M. C. Chu,61a J. Chudoba,138 A. J. Chuinard,101 J. J. Chwastowski,82 L. Chytka,127 D. Cinca,45 V. Cindro,89 I. A. Cioară,24 A. Ciocio,18 F. Cirotto,67a,67b Z. H. Citron,177 M. Citterio,66a A. Clark,52 M. R. Clark,38 P. J. Clark,48 C. Clement,43a,43b Y. Coadou,99 M. Cobal,64a,64c A. Coccaro,53b,53a J. Cochran,76 H. Cohen,158 A. E. C. Coimbra,177 L. Colasurdo,117 B. Cole,38 A. P. Colijn,118 J. Collot,56 P. Conde Muiño,137a,m E. Coniavitis,50 S. H. Connell,32b I. A. Connelly,98 S. Constantinescu,27b F. Conventi,67a,n A. M. Cooper-Sarkar,132 F. Cormier,172 K. J. R. Cormier,164 L. D. Corpe,92 M. Corradi,70a,70b E. E. Corrigan,94 F. Corriveau,101,o A. Cortes-Gonzalez,35 M. J. Costa,171 F. Costanza,5 D. Costanzo,146 G. Cottin,31 G. Cowan,91 B. E. Cox,98 J. Crane,98 K. Cranmer,122 S. J. Crawley,55 R. A. Creager,134 G. Cree,33 S. Crépé-Renaudin,56 F. Crescioli,133 M. Cristinziani,24 V. Croft,122 G. Crosetti,40b,40a A. Cueto,96 T. Cuhadar Donszelmann,146 A. R. Cukierman,150 S. Czekierda,82 P. Czodrowski,35 M. J. Da Cunha Sargedas De Sousa,58b C. Da Via,98 W. Dabrowski,81a T. Dado,28a,p S. Dahbi,34e T. Dai,103 F. Dallaire,107 C. Dallapiccola,100 M. Dam,39 G. D’amen,23b,23a J. Damp,97 J. R. Dandoy,134 M. F. Daneri,30 N. P. Dang,178,g N. D Dann,98 M. Danninger,172 V. Dao,35 G. Darbo,53b S. Darmora,8 O. Dartsi,5 A. Dattagupta,128 T. Daubney,44 S. D’Auria,66a,66b W. Davey,24 C. David,44 T. Davidek,140 D. R. Davis,47 E. Dawe,102 I. Dawson,146 K. De,8 R. De Asmundis,67a A. De Benedetti,125 M. De Beurs,118 S. De Castro,23b,23a S. De Cecco,70a,70b N. De Groot,117 P. de Jong,118 H. De la Torre,104 F. De Lorenzi,76 A. De Maria,69a,69b D. De Pedis,70a A. De Salvo,70a U. De Sanctis,71a,71b M. De Santis,71a,71b A. De Santo,153 K. De Vasconcelos Corga,99 J. B. De Vivie De Regie,129 C. Debenedetti,143 D. V. Dedovich,77 N. Dehghanian,3 M. Del Gaudio,40b,40a J. Del Peso,96 Y. Delabat Diaz,44 D. Delgove,129 F. Deliot,142 C. M. Delitzsch,7 M. Della Pietra,67a,67b D. Della Volpe,52 A. Dell’Acqua,35 L. Dell’Asta,25 M. Delmastro,5 C. Delporte,129 P. A. Delsart,56 D. A. DeMarco,164 S. Demers,180 M. Demichev,77 S. P. Denisov,121 D. Denysiuk,118 L. D’Eramo,133 D. Derendarz,82 J. E. Derkaoui,34d F. Derue,133 P. Dervan,88 K. Desch,24 C. Deterre,44 K. Dette,164 M. R. Devesa,30 P. O. Deviveiros,35 A. Dewhurst,141 S. Dhaliwal,26 F. A. Di Bello,52 A. Di Ciaccio,71a,71b L. Di Ciaccio,5 W. K. Di Clemente,134 C. Di Donato,67a,67b A. Di Girolamo,35 G. Di Gregorio,69a,69b B. Di Micco,72a,72b R. Di Nardo,100 K. F. Di Petrillo,57 R. Di Sipio,164 D. Di Valentino,33 C. Diaconu,99 M. Diamond,164 F. A. Dias,39 T. Dias Do Vale,137a M. A. Diaz,144a J. Dickinson,18 E. B. Diehl,103 J. Dietrich,19 S. Díez Cornell,44 A. Dimitrievska,18 J. Dingfelder,24 F. Dittus,35 F. Djama,99 T. Djobava,156b J. I. Djuvsland,59a M. A. B. Do Vale,78c M. Dobre,27b D. Dodsworth,26 C. Doglioni,94 J. Dolejsi,140 Z. Dolezal,140 M. Donadelli,78d J. Donini,37 A. D’onofrio,90 M. D’Onofrio,88 J. Dopke,141 A. Doria,67a M. T. Dova,86 A. T. Doyle,55 E. Drechsler,51 E. Dreyer,149 T. Dreyer,51 Y. Du,58b F. Dubinin,108 M. Dubovsky,28a A. Dubreuil,52 E. Duchovni,177 G. Duckeck,112 A. Ducourthial,133 O. A. Ducu,107,q D. Duda,113 A. Dudarev,35 A. C. Dudder,97 E. M. Duffield,18 L. Duflot,129 M. Dührssen,35 C. Dülsen,179 M. Dumancic,177 A. E. Dumitriu,27b,r A. K. Duncan,55 M. Dunford,59a A. Duperrin,99 H. Duran Yildiz,4a M. Düren,54 A. Durglishvili,156b D. Duschinger,46 B. Dutta,44 D. Duvnjak,1 M. Dyndal,44 S. Dysch,98 B. S. Dziedzic,82 C. Eckardt,44 K. M. Ecker,113 R. C. Edgar,103 T. Eifert,35 G. Eigen,17 K. Einsweiler,18 T. Ekelof,169 M. El Kacimi,34c R. El Kosseifi,99 V. Ellajosyula,99 M. Ellert,169 F. Ellinghaus,179 A. A. Elliot,90 N. Ellis,35 J. Elmsheuser,29 M. Elsing,35 D. Emeliyanov,141 A. Emerman,38 Y. Enari,160 J. S. Ennis,175 M. B. Epland,47 J. Erdmann,45 A. Ereditato,20 S. Errede,170 M. Escalier,129 C. Escobar,171 O. Estrada Pastor,171 A. I. Etienvre,142 E. Etzion,158 H. Evans,63 A. Ezhilov,135 M. Ezzi,34e F. Fabbri,55 L. Fabbri,23b,23a V. Fabiani,117 G. Facini,92 R. M. Faisca Rodrigues Pereira,137a R. M. Fakhrutdinov,121 S. Falciano,70a P. J. Falke,5 S. Falke,5 J. Faltova,140 Y. Fang,15a M. Fanti,66a,66b A. Farbin,8 A. Farilla,72a E. M. Farina,68a,68b T. Farooque,104 S. Farrell,18 S. M. Farrington,175 P. Farthouat,35 F. Fassi,34e P. Fassnacht,35 151801-8 PHYSICAL REVIEW LETTERS 122, 151801 (2019) D. Fassouliotis,9 M. Faucci Giannelli,48 A. Favareto,53b,53a W. J. Fawcett,31 L. Fayard,129 O. L. Fedin,135,s W. Fedorko,172 M. Feickert,41 S. Feigl,131 L. Feligioni,99 C. Feng,58b E. J. Feng,35 M. Feng,47 M. J. Fenton,55 A. B. Fenyuk,121 L. Feremenga,8 J. Ferrando,44 A. Ferrari,169 P. Ferrari,118 R. Ferrari,68a D. E. Ferreira de Lima,59b A. Ferrer,171 D. Ferrere,52 C. Ferretti,103 F. Fiedler,97 A. Filipčič,89 F. Filthaut,117 K. D. Finelli,25 M. C. N. Fiolhais,137a,137c,t L. Fiorini,171 C. Fischer,14 W. C. Fisher,104 N. Flaschel,44 I. Fleck,148 P. Fleischmann,103 R. R. M. Fletcher,134 T. Flick,179 B. M. Flierl,112 L. M. Flores,134 L. R. Flores Castillo,61a F. M. Follega,73a,73b N. Fomin,17 G. T. Forcolin,73a,73b A. Formica,142 F. A. Förster,14 A. C. Forti,98 A. G. Foster,21 D. Fournier,129 H. Fox,87 S. Fracchia,146 P. Francavilla,69a,69b M. Franchini,23b,23a S. Franchino,59a D. Francis,35 L. Franconi,143 M. Franklin,57 M. Frate,168 M. Fraternali,68a,68b A. N. Fray,90 D. Freeborn,92 B. Freund,107 W. S. Freund,78b E. M. Freundlich,45 D. C. Frizzell,125 D. Froidevaux,35 J. A. Frost,132 C. Fukunaga,161 E. Fullana Torregrosa,171 T. Fusayasu,114 J. Fuster,171 O. Gabizon,157 A. Gabrielli,23b,23a A. Gabrielli,18 G. P. Gach,81a S. Gadatsch,52 P. Gadow,113 G. Gagliardi,53b,53a L. G. Gagnon,107 C. Galea,27b B. Galhardo,137a,137c E. J. Gallas,132 B. J. Gallop,141 P. Gallus,139 G. Galster,39 R. Gamboa Goni,90 K. K. Gan,123 S. Ganguly,177 J. Gao,58a Y. Gao,88 Y. S. Gao,150,h C. García,171 J. E. García Navarro,171 J. A. García Pascual,15a M. Garcia-Sciveres,18 R. W. Gardner,36 N. Garelli,150 S. Gargiulo,50 V. Garonne,131 K. Gasnikova,44 A. Gaudiello,53b,53a G. Gaudio,68a I. L. Gavrilenko,108 A. Gavrilyuk,109 C. Gay,172 G. Gaycken,24 E. N. Gazis,10 C. N. P. Gee,141 J. Geisen,51 M. Geisen,97 M. P. Geisler,59a C. Gemme,53b M. H. Genest,56 C. Geng,103 S. Gentile,70a,70b S. George,91 D. Gerbaudo,14 G. Gessner,45 S. Ghasemi,148 M. Ghasemi Bostanabad,173 M. Ghneimat,24 B. Giacobbe,23b S. Giagu,70a,70b N. Giangiacomi,23b,23a P. Giannetti,69a A. Giannini,67a,67b S. M. Gibson,91 M. Gignac,143 D. Gillberg,33 G. Gilles,179 D. M. Gingrich,3,f M. P. Giordani,64a,64c F. M. Giorgi,23b P. F. Giraud,142 P. Giromini,57 G. Giugliarelli,64a,64c D. Giugni,66a F. Giuli,132 M. Giulini,59b S. Gkaitatzis,159 I. Gkialas,9,u E. L. Gkougkousis,14 P. Gkountoumis,10 L. K. Gladilin,111 C. Glasman,96 J. Glatzer,14 P. C. F. Glaysher,44 A. Glazov,44 M. Goblirsch-Kolb,26 J. Godlewski,82 S. Goldfarb,102 T. Golling,52 D. Golubkov,121 A. Gomes,137a,137b R. Goncalves Gama,51 R. Gonçalo,137a G. Gonella,50 L. Gonella,21 A. Gongadze,77 F. Gonnella,21 J. L. Gonski,57 S. González de la Hoz,171 S. Gonzalez-Sevilla,52 L. Goossens,35 P. A. Gorbounov,109 H. A. Gordon,29 B. Gorini,35 E. Gorini,65a,65b A. Gorišek,89 A. T. Goshaw,47 C. Gössling,45 M. I. Gostkin,77 C. A. Gottardo,24 C. R. Goudet,129 D. Goujdami,34c A. G. Goussiou,145 N. Govender,32b,v C. Goy,5 E. Gozani,157 I. Grabowska-Bold,81a P. O. J. Gradin,169 E. C. Graham,88 J. Gramling,168 E. Gramstad,131 S. Grancagnolo,19 V. Gratchev,135 P. M. Gravila,27f F. G. Gravili,65a,65b C. Gray,55 H. M. Gray,18 Z. D. Greenwood,93,w C. Grefe,24 K. Gregersen,94 I. M. Gregor,44 P. Grenier,150 K. Grevtsov,44 N. A. Grieser,125 J. Griffiths,8 A. A. Grillo,143 K. Grimm,150,x S. Grinstein,14,y Ph. Gris,37 J.-F. Grivaz,129 S. Groh,97 E. Gross,177 J. Grosse-Knetter,51 G. C. Grossi,93 Z. J. Grout,92 C. Grud,103 A. Grummer,116 L. Guan,103 W. Guan,178 J. Guenther,35 A. Guerguichon,129 F. Guescini,165a D. Guest,168 R. Gugel,50 B. Gui,123 T. Guillemin,5 S. Guindon,35 U. Gul,55 C. Gumpert,35 J. Guo,58c W. Guo,103 Y. Guo,58a,z Z. Guo,99 R. Gupta,44 S. Gurbuz,12c G. Gustavino,125 B. J. Gutelman,157 P. Gutierrez,125 C. Gutschow,92 C. Guyot,142 M. P. Guzik,81a C. Gwenlan,132 C. B. Gwilliam,88 A. Haas,122 C. Haber,18 H. K. Hadavand,8 N. Haddad,34e A. Hadef,58a S. Hageböck,24 M. Hagihara,166 H. Hakobyan,181,a M. Haleem,174 J. Haley,126 G. Halladjian,104 G. D. Hallewell,99 K. Hamacher,179 P. Hamal,127 K. Hamano,173 A. Hamilton,32a G. N. Hamity,146 K. Han,58a,aa L. Han,58a S. Han,15d K. Hanagaki,79,bb M. Hance,143 D. M. Handl,112 B. Haney,134 R. Hankache,133 P. Hanke,59a E. Hansen,94 J. B. Hansen,39 J. D. Hansen,39 M. C. Hansen,24 P. H. Hansen,39 K. Hara,166 A. S. Hard,178 T. Harenberg,179 S. Harkusha,105 P. F. Harrison,175 N. M. Hartmann,112 Y. Hasegawa,147 A. Hasib,48 S. Hassani,142 S. Haug,20 R. Hauser,104 L. Hauswald,46 L. B. Havener,38 M. Havranek,139 C. M. Hawkes,21 R. J. Hawkings,35 D. Hayden,104 C. Hayes,152 C. P. Hays,132 J. M. Hays,90 H. S. Hayward,88 S. J. Haywood,141 F. He,58a M. P. Heath,48 V. Hedberg,94 L. Heelan,8 S. Heer,24 K. K. Heidegger,50 J. Heilman,33 S. Heim,44 T. Heim,18 B. Heinemann,44,cc J. J. Heinrich,112 L. Heinrich,122 C. Heinz,54 J. Hejbal,138 L. Helary,35 A. Held,172 S. Hellesund,131 C. M. Helling,143 S. Hellman,43a,43b C. Helsens,35 R. C. W. Henderson,87 Y. Heng,178 S. Henkelmann,172 A. M. Henriques Correia,35 G. H. Herbert,19 H. Herde,26 V. Herget,174 Y. Hernández Jiménez,32c H. Herr,97 M. G. Herrmann,112 T. Herrmann,46 G. Herten,50 R. Hertenberger,112 L. Hervas,35 T. C. Herwig,134 G. G. Hesketh,92 N. P. Hessey,165a A. Higashida,160 S. Higashino,79 E. Higón-Rodriguez,171 K. Hildebrand,36 E. Hill,173 J. C. Hill,31 K. K. Hill,29 K. H. Hiller,44 S. J. Hillier,21 M. Hils,46 I. Hinchliffe,18 F. Hinterkeuser,24 M. Hirose,130 D. Hirschbuehl,179 B. Hiti,89 O. Hladik,138 D. R. Hlaluku,32c X. Hoad,48 J. Hobbs,152 N. Hod,165a M. C. Hodgkinson,146 A. Hoecker,35 M. R. Hoeferkamp,116 F. Hoenig,112 D. Hohn,50 D. Hohov,129 T. R. Holmes,36 M. Holzbock,112 M. Homann,45 B. H. Hommels,31 S. Honda,166 T. Honda,79 T. M. Hong,136 A. Hönle,113 B. H. Hooberman,170 W. H. Hopkins,128 Y. Horii,115 P. Horn,46 A. J. Horton,149 L. A. Horyn,36 J-Y. Hostachy,56 151801-9 PHYSICAL REVIEW LETTERS 122, 151801 (2019) A. Hostiuc,145 S. Hou,155 A. Hoummada,34a J. Howarth,98 J. Hoya,86 M. Hrabovsky,127 I. Hristova,19 J. Hrivnac,129 A. Hrynevich,106 T. Hryn’ova,5 P. J. Hsu,62 S.-C. Hsu,145 Q. Hu,29 S. Hu,58c Y. Huang,15a Z. Hubacek,139 F. Hubaut,99 M. Huebner,24 F. Huegging,24 T. B. Huffman,132 M. Huhtinen,35 R. F. H. Hunter,33 P. Huo,152 A. M. Hupe,33 N. Huseynov,77,e J. Huston,104 J. Huth,57 R. Hyneman,103 G. Iacobucci,52 G. Iakovidis,29 I. Ibragimov,148 L. Iconomidou-Fayard,129 Z. Idrissi,34e P. Iengo,35 R. Ignazzi,39 O. Igonkina,118,dd R. Iguchi,160 T. Iizawa,52 Y. Ikegami,79 M. Ikeno,79 D. Iliadis,159 N. Ilic,117 F. Iltzsche,46 G. Introzzi,68a,68b M. Iodice,72a K. Iordanidou,38 V. Ippolito,70a,70b M. F. Isacson,169 N. Ishijima,130 M. Ishino,160 M. Ishitsuka,162 W. Islam,126 C. Issever,132 S. Istin,157 F. Ito,166 J. M. Iturbe Ponce,61a R. Iuppa,73a,73b A. Ivina,177 H. Iwasaki,79 J. M. Izen,42 V. Izzo,67a P. Jacka,138 P. Jackson,1 R. M. Jacobs,24 V. Jain,2 G. Jäkel,179 K. B. Jakobi,97 K. Jakobs,50 S. Jakobsen,74 T. Jakoubek,138 D. O. Jamin,126 R. Jansky,52 J. Janssen,24 M. Janus,51 P. A. Janus,81a G. Jarlskog,94 N. Javadov,77,e T. Javůrek,35 M. Javurkova,50 F. Jeanneau,142 L. Jeanty,18 J. Jejelava,156a,ee A. Jelinskas,175 P. Jenni,50,ff J. Jeong,44 N. Jeong,44 S. Jézéquel,5 H. Ji,178 J. Jia,152 H. Jiang,76 Y. Jiang,58a Z. Jiang,150,gg S. Jiggins,50 F. A. Jimenez Morales,37 J. Jimenez Pena,171 S. Jin,15c A. Jinaru,27b O. Jinnouchi,162 H. Jivan,32c P. Johansson,146 K. A. Johns,7 C. A. Johnson,63 K. Jon-And,43a,43b R. W. L. Jones,87 S. D. Jones,153 S. Jones,7 T. J. Jones,88 J. Jongmanns,59a P. M. Jorge,137a,137b J. Jovicevic,165a X. Ju,18 J. J. Junggeburth,113 A. Juste Rozas,14,y A. Kaczmarska,82 M. Kado,129 H. Kagan,123 M. Kagan,150 T. Kaji,176 E. Kajomovitz,157 C. W. Kalderon,94 A. Kaluza,97 S. Kama,41 A. Kamenshchikov,121 L. Kanjir,89 Y. Kano,160 V. A. Kantserov,110 J. Kanzaki,79 L. S. Kaplan,178 D. Kar,32c M. J. Kareem,165b E. Karentzos,10 S. N. Karpov,77 Z. M. Karpova,77 V. Kartvelishvili,87 A. N. Karyukhin,121 L. Kashif,178 R. D. Kass,123 A. Kastanas,43a,43b Y. Kataoka,160 C. Kato,58d,58c J. Katzy,44 K. Kawade,80 K. Kawagoe,85 T. Kawamoto,160 G. Kawamura,51 E. F. Kay,88 V. F. Kazanin,120b,120a R. Keeler,173 R. Kehoe,41 J. S. Keller,33 E. Kellermann,94 J. J. Kempster,21 J. Kendrick,21 O. Kepka,138 S. Kersten,179 B. P. Kerševan,89 S. Ketabchi Haghighat,164 R. A. Keyes,101 M. Khader,170 F. Khalil-Zada,13 A. Khanov,126 A. G. Kharlamov,120b,120a T. Kharlamova,120b,120a E. E. Khoda,172 A. Khodinov,163 T. J. Khoo,52 E. Khramov,77 J. Khubua,156b S. Kido,80 M. Kiehn,52 C. R. Kilby,91 Y. K. Kim,36 N. Kimura,64a,64c O. M. Kind,19 B. T. King,88 D. Kirchmeier,46 J. Kirk,141 A. E. Kiryunin,113 T. Kishimoto,160 D. Kisielewska,81a V. Kitali,44 O. Kivernyk,5 E. Kladiva,28b,a T. Klapdor-Kleingrothaus,50 M. H. Klein,103 M. Klein,88 U. Klein,88 K. Kleinknecht,97 P. Klimek,119 A. Klimentov,29 T. Klingl,24 T. Klioutchnikova,35 F. F. Klitzner,112 P. Kluit,118 S. Kluth,113 E. Kneringer,74 E. B. F. G. Knoops,99 A. Knue,50 A. Kobayashi,160 D. Kobayashi,85 T. Kobayashi,160 M. Kobel,46 M. Kocian,150 P. Kodys,140 P. T. Koenig,24 T. Koffas,33 E. Koffeman,118 N. M. Köhler,113 T. Koi,150 M. Kolb,59b I. Koletsou,5 T. Kondo,79 N. Kondrashova,58c K. Köneke,50 A. C. König,117 T. Kono,79 R. Konoplich,122,hh V. Konstantinides,92 N. Konstantinidis,92 B. Konya,94 R. Kopeliansky,63 S. Koperny,81a K. Korcyl,82 K. Kordas,159 G. Koren,158 A. Korn,92 I. Korolkov,14 E. V. Korolkova,146 N. Korotkova,111 O. Kortner,113 S. Kortner,113 T. Kosek,140 V. V. Kostyukhin,24 A. Kotwal,47 A. Koulouris,10 A. Kourkoumeli-Charalampidi,68a,68b C. Kourkoumelis,9 E. Kourlitis,146 V. Kouskoura,29 A. B. Kowalewska,82 R. Kowalewski,173 T. Z. Kowalski,81a C. Kozakai,160 W. Kozanecki,142 A. S. Kozhin,121 V. A. Kramarenko,111 G. Kramberger,89 D. Krasnopevtsev,58a M. W. Krasny,133 A. Krasznahorkay,35 D. Krauss,113 J. A. Kremer,81a J. Kretzschmar,88 P. Krieger,164 K. Krizka,18 K. Kroeninger,45 H. Kroha,113 J. Kroll,138 J. Kroll,134 J. Krstic,16 U. Kruchonak,77 H. Krüger,24 N. Krumnack,76 M. C. Kruse,47 T. Kubota,102 S. Kuday,4b J. T. Kuechler,179 S. Kuehn,35 A. Kugel,59a T. Kuhl,44 V. Kukhtin,77 R. Kukla,99 Y. Kulchitsky,105,ii S. Kuleshov,144b Y. P. Kulinich,170 M. Kuna,56 T. Kunigo,83 A. Kupco,138 T. Kupfer,45 O. Kuprash,158 H. Kurashige,80 L. L. Kurchaninov,165a Y. A. Kurochkin,105 A. Kurova,110 M. G. Kurth,15d E. S. Kuwertz,35 M. Kuze,162 J. Kvita,127 T. Kwan,101 A. La Rosa,113 J. L. La Rosa Navarro,78d L. La Rotonda,40b,40a F. La Ruffa,40b,40a C. Lacasta,171 F. Lacava,70a,70b J. Lacey,44 D. P. J. Lack,98 H. Lacker,19 D. Lacour,133 E. Ladygin,77 R. Lafaye,5 B. Laforge,133 T. Lagouri,32c S. Lai,51 S. Lammers,63 W. Lampl,7 E. Lançon,29 U. Landgraf,50 M. P. J. Landon,90 M. C. Lanfermann,52 V. S. Lang,44 J. C. Lange,51 R. J. Langenberg,35 A. J. Lankford,168 F. Lanni,29 K. Lantzsch,24 A. Lanza,68a A. Lapertosa,53b,53a S. Laplace,133 J. F. Laporte,142 T. Lari,66a F. Lasagni Manghi,23b,23a M. Lassnig,35 T. S. Lau,61a A. Laudrain,129 M. Lavorgna,67a,67b M. Lazzaroni,66a,66b B. Le,102 O. Le Dortz,133 E. Le Guirriec,99 E. P. Le Quilleuc,142 M. LeBlanc,7 T. LeCompte,6 F. Ledroit-Guillon,56 C. A. Lee,29 G. R. Lee,144a L. Lee,57 S. C. Lee,155 B. Lefebvre,101 M. Lefebvre,173 F. Legger,112 C. Leggett,18 K. Lehmann,149 N. Lehmann,179 G. Lehmann Miotto,35 W. A. Leight,44 A. Leisos,159,jj M. A. L. Leite,78d R. Leitner,140 D. Lellouch,177 K. J. C. Leney,92 T. Lenz,24 B. Lenzi,35 R. Leone,7 S. Leone,69a C. Leonidopoulos,48 G. Lerner,153 C. Leroy,107 R. Les,164 A. A. J. Lesage,142 C. G. Lester,31 M. Levchenko,135 J. Levêque,5 D. Levin,103 L. J. Levinson,177 D. Lewis,90 B. Li,15b B. Li,103 C-Q. Li,58a,kk H. Li,58a H. Li,58b L. Li,58c M. Li,15a Q. Li,15d Q. Y. Li,58a S. Li,58d,58c X. Li,58c Y. Li,148 Z. Liang,15a 151801-10 PHYSICAL REVIEW LETTERS 122, 151801 (2019) B. Liberti,71a A. Liblong,164 K. Lie,61c S. Liem,118 A. Limosani,154 C. Y. Lin,31 K. Lin,104 T. H. Lin,97 R. A. Linck,63 J. H. Lindon,21 B. E. Lindquist,152 A. L. Lionti,52 E. Lipeles,134 A. Lipniacka,17 M. Lisovyi,59b T. M. Liss,170,ll A. Lister,172 A. M. Litke,143 J. D. Little,8 B. Liu,76 B. L Liu,6 H. B. Liu,29 H. Liu,103 J. B. Liu,58a J. K. K. Liu,132 K. Liu,133 M. Liu,58a P. Liu,18 Y. Liu,15a Y. L. Liu,58a Y. W. Liu,58a M. Livan,68a,68b A. Lleres,56 J. Llorente Merino,15a S. L. Lloyd,90 C. Y. Lo,61b F. Lo Sterzo,41 E. M. Lobodzinska,44 P. Loch,7 T. Lohse,19 K. Lohwasser,146 M. Lokajicek,138 J. D. Long,170 R. E. Long,87 L. Longo,65a,65b K. A. Looper,123 J. A. Lopez,144b I. Lopez Paz,98 A. Lopez Solis,146 J. Lorenz,112 N. Lorenzo Martinez,5 M. Losada,22 P. J. Lösel,112 A. Lösle,50 X. Lou,44 X. Lou,15a A. Lounis,129 J. Love,6 P. A. Love,87 J. J. Lozano Bahilo,171 H. Lu,61a M. Lu,58a Y. J. Lu,62 H. J. Lubatti,145 C. Luci,70a,70b A. Lucotte,56 C. Luedtke,50 F. Luehring,63 I. Luise,133 L. Luminari,70a B. Lund-Jensen,151 M. S. Lutz,100 P. M. Luzi,133 D. Lynn,29 R. Lysak,138 E. Lytken,94 F. Lyu,15a V. Lyubushkin,77 T. Lyubushkina,77 H. Ma,29 L. L. Ma,58b Y. Ma,58b G. Maccarrone,49 A. Macchiolo,113 C. M. Macdonald,146 J. Machado Miguens,134,137b D. Madaffari,171 R. Madar,37 W. F. Mader,46 A. Madsen,44 N. Madysa,46 J. Maeda,80 K. Maekawa,160 S. Maeland,17 T. Maeno,29 M. Maerker,46 A. S. Maevskiy,111 V. Magerl,50 D. J. Mahon,38 C. Maidantchik,78b T. Maier,112 A. Maio,137a,137b,137d O. Majersky,28a S. Majewski,128 Y. Makida,79 N. Makovec,129 B. Malaescu,133 Pa. Malecki,82 V. P. Maleev,135 F. Malek,56 U. Mallik,75 D. Malon,6 C. Malone,31 S. Maltezos,10 S. Malyukov,35 J. Mamuzic,171 G. Mancini,49 I. Mandić,89 J. Maneira,137a L. Manhaes de Andrade Filho,78a J. Manjarres Ramos,46 K. H. Mankinen,94 A. Mann,112 A. Manousos,74 B. Mansoulie,142 J. D. Mansour,15a S. Manzoni,66a,66b A. Marantis,159 G. Marceca,30 L. March,52 L. Marchese,132 G. Marchiori,133 M. Marcisovsky,138 C. Marcon,94 C. A. Marin Tobon,35 M. Marjanovic,37 F. Marroquim,78b Z. Marshall,18 M. U. F Martensson,169 S. Marti-Garcia,171 C. B. Martin,123 T. A. Martin,175 V. J. Martin,48 B. Martin dit Latour,17 M. Martinez,14,y V. I. Martinez Outschoorn,100 S. Martin-Haugh,141 V. S. Martoiu,27b A. C. Martyniuk,92 A. Marzin,35 L. Masetti,97 T. Mashimo,160 R. Mashinistov,108 J. Masik,98 A. L. Maslennikov,120b,120a L. H. Mason,102 L. Massa,71a,71b P. Massarotti,67a,67b P. Mastrandrea,152 A. Mastroberardino,40b,40a T. Masubuchi,160 P. Mättig,179 J. Maurer,27b B. Maček,89 S. J. Maxfield,88 D. A. Maximov,120b,120a R. Mazini,155 I. Maznas,159 S. M. Mazza,143 G. Mc Goldrick,164 S. P. Mc Kee,103 A. McCarn,41 T. G. McCarthy,113 L. I. McClymont,92 W. P. McCormack,18 E. F. McDonald,102 J. A. Mcfayden,35 G. Mchedlidze,51 M. A. McKay,41 K. D. McLean,173 S. J. McMahon,141 P. C. McNamara,102 C. J. McNicol,175 R. A. McPherson,173,o J. E. Mdhluli,32c Z. A. Meadows,100 S. Meehan,145 T. M. Megy,50 S. Mehlhase,112 A. Mehta,88 T. Meideck,56 B. Meirose,42 D. Melini,171,mm B. R. Mellado Garcia,32c J. D. Mellenthin,51 M. Melo,28a F. Meloni,44 A. Melzer,24 S. B. Menary,98 E. D. Mendes Gouveia,137a L. Meng,88 X. T. Meng,103 S. Menke,113 E. Meoni,40b,40a S. Mergelmeyer,19 S. A. M. Merkt,136 C. Merlassino,20 P. Mermod,52 L. Merola,67a,67b C. Meroni,66a F. S. Merritt,36 A. Messina,70a,70b J. Metcalfe,6 A. S. Mete,168 C. Meyer,134 J. Meyer,157 J-P. Meyer,142 H. Meyer Zu Theenhausen,59a F. Miano,153 R. P. Middleton,141 L. Mijović,48 G. Mikenberg,177 M. Mikestikova,138 M. Mikuž,89 M. Milesi,102 A. Milic,164 D. A. Millar,90 D. W. Miller,36 A. Milov,177 D. A. Milstead,43a,43b R. A. Mina,150,gg A. A. Minaenko,121 M. Miñano Moya,171 I. A. Minashvili,156b A. I. Mincer,122 B. Mindur,81a M. Mineev,77 Y. Minegishi,160 Y. Ming,178 L. M. Mir,14 A. Mirto,65a,65b K. P. Mistry,134 T. Mitani,176 J. Mitrevski,112 V. A. Mitsou,171 M. Mittal,58c A. Miucci,20 P. S. Miyagawa,146 A. Mizukami,79 J. U. Mjörnmark,94 T. Mkrtchyan,181 M. Mlynarikova,140 T. Moa,43a,43b K. Mochizuki,107 P. Mogg,50 S. Mohapatra,38 S. Molander,43a,43b R. Moles-Valls,24 M. C. Mondragon,104 K. Mönig,44 J. Monk,39 E. Monnier,99 A. Montalbano,149 J. Montejo Berlingen,35 F. Monticelli,86 S. Monzani,66a N. Morange,129 D. Moreno,22 M. Moreno Llácer,35 P. Morettini,53b M. Morgenstern,118 S. Morgenstern,46 D. Mori,149 M. Morii,57 M. Morinaga,176 V. Morisbak,131 A. K. Morley,35 G. Mornacchi,35 A. P. Morris,92 J. D. Morris,90 L. Morvaj,152 P. Moschovakos,10 M. Mosidze,156b H. J. Moss,146 J. Moss,150,nn K. Motohashi,162 R. Mount,150 E. Mountricha,35 E. J. W. Moyse,100 S. Muanza,99 F. Mueller,113 J. Mueller,136 R. S. P. Mueller,112 D. Muenstermann,87 G. A. Mullier,94 F. J. Munoz Sanchez,98 P. Murin,28b W. J. Murray,175,141 A. Murrone,66a,66b M. Muškinja,89 C. Mwewa,32a A. G. Myagkov,121,oo J. Myers,128 M. Myska,139 B. P. Nachman,18 O. Nackenhorst,45 K. Nagai,132 K. Nagano,79 Y. Nagasaka,60 M. Nagel,50 E. Nagy,99 A. M. Nairz,35 Y. Nakahama,115 K. Nakamura,79 T. Nakamura,160 I. Nakano,124 H. Nanjo,130 F. Napolitano,59a R. F. Naranjo Garcia,44 R. Narayan,11 D. I. Narrias Villar,59a I. Naryshkin,135 T. Naumann,44 G. Navarro,22 R. Nayyar,7 H. A. Neal,103,a P. Y. Nechaeva,108 T. J. Neep,142 A. Negri,68a,68b M. Negrini,23b S. Nektarijevic,117 C. Nellist,51 M. E. Nelson,132 S. Nemecek,138 P. Nemethy,122 M. Nessi,35,pp M. S. Neubauer,170 M. Neumann,179 P. R. Newman,21 T. Y. Ng,61c Y. S. Ng,19 Y. W. Y. Ng,168 H. D. N. Nguyen,99 T. Nguyen Manh,107 E. Nibigira,37 R. B. Nickerson,132 R. Nicolaidou,142 D. S. Nielsen,39 J. Nielsen,143 N. Nikiforou,11 V. Nikolaenko,121,oo I. Nikolic-Audit,133 K. Nikolopoulos,21 P. Nilsson,29 Y. Ninomiya,79 A. Nisati,70a N. Nishu,58c R. Nisius,113 I. Nitsche,45 T. Nitta,176 T. Nobe,160 151801-11 PHYSICAL REVIEW LETTERS 122, 151801 (2019) Y. Noguchi,83 M. Nomachi,130 I. Nomidis,133 M. A. Nomura,29 T. Nooney,90 M. Nordberg,35 N. Norjoharuddeen,132 T. Novak,89 O. Novgorodova,46 R. Novotny,139 L. Nozka,127 K. Ntekas,168 E. Nurse,92 F. Nuti,102 F. G. Oakham,33,f H. Oberlack,113 J. Ocariz,133 A. Ochi,80 I. Ochoa,38 J. P. Ochoa-Ricoux,144a K. O’Connor,26 S. Oda,85 S. Odaka,79 S. Oerdek,51 A. Oh,98 S. H. Oh,47 C. C. Ohm,151 H. Oide,53b,53a M. L. Ojeda,164 H. Okawa,166 Y. Okazaki,83 Y. Okumura,160 T. Okuyama,79 A. Olariu,27b L. F. Oleiro Seabra,137a S. A. Olivares Pino,144a D. Oliveira Damazio,29 J. L. Oliver,1 M. J. R. Olsson,36 A. Olszewski,82 J. Olszowska,82 D. C. O’Neil,149 A. Onofre,137a,137e K. Onogi,115 P. U. E. Onyisi,11 H. Oppen,131 M. J. Oreglia,36 G. E. Orellana,86 Y. Oren,158 D. Orestano,72a,72b E. C. Orgill,98 N. Orlando,61b A. A. O’Rourke,44 R. S. Orr,164 B. Osculati,53b,53a,a V. O’Shea,55 R. Ospanov,58a G. Otero y Garzon,30 H. Otono,85 M. Ouchrif,34d F. Ould-Saada,131 A. Ouraou,142 Q. Ouyang,15a M. Owen,55 R. E. Owen,21 V. E. Ozcan,12c N. Ozturk,8 J. Pacalt,127 H. A. Pacey,31 K. Pachal,149 A. Pacheco Pages,14 L. Pacheco Rodriguez,142 C. Padilla Aranda,14 S. Pagan Griso,18 M. Paganini,180 G. Palacino,63 S. Palazzo,48 S. Palestini,35 M. Palka,81b D. Pallin,37 I. Panagoulias,10 C. E. Pandini,35 J. G. Panduro Vazquez,91 P. Pani,35 G. Panizzo,64a,64c L. Paolozzi,52 T. D. Papadopoulou,10 K. Papageorgiou,9,u A. Paramonov,6 D. Paredes Hernandez,61b S. R. Paredes Saenz,132 B. Parida,163 T. H. Park,33 A. J. Parker,87 K. A. Parker,44 M. A. Parker,31 F. Parodi,53b,53a J. A. Parsons,38 U. Parzefall,50 V. R. Pascuzzi,164 J. M. P. Pasner,143 E. Pasqualucci,70a S. Passaggio,53b F. Pastore,91 P. Pasuwan,43a,43b S. Pataraia,97 J. R. Pater,98 A. Pathak,178,g T. Pauly,35 B. Pearson,113 M. Pedersen,131 L. Pedraza Diaz,117 R. Pedro,137a,137b S. V. Peleganchuk,120b,120a O. Penc,138 C. Peng,15d H. Peng,58a B. S. Peralva,78a M. M. Perego,129 A. P. Pereira Peixoto,137a D. V. Perepelitsa,29 F. Peri,19 L. Perini,66a,66b H. Pernegger,35 S. Perrella,67a,67b V. D. Peshekhonov,77,a K. Peters,44 R. F. Y. Peters,98 B. A. Petersen,35 T. C. Petersen,39 E. Petit,56 A. Petridis,1 C. Petridou,159 P. Petroff,129 M. Petrov,132 F. Petrucci,72a,72b M. Pettee,180 N. E. Pettersson,100 A. Peyaud,142 R. Pezoa,144b T. Pham,102 F. H. Phillips,104 P. W. Phillips,141 M. W. Phipps,170 G. Piacquadio,152 E. Pianori,18 A. Picazio,100 R. H. Pickles,98 R. Piegaia,30 J. E. Pilcher,36 A. D. Pilkington,98 M. Pinamonti,71a,71b J. L. Pinfold,3 M. Pitt,177 L. Pizzimento,71a,71b M.-A. Pleier,29 V. Pleskot,140 E. Plotnikova,77 D. Pluth,76 P. Podberezko,120b,120a R. Poettgen,94 R. Poggi,52 L. Poggioli,129 I. Pogrebnyak,104 D. Pohl,24 I. Pokharel,51 G. Polesello,68a A. Poley,18 A. Policicchio,70a,70b R. Polifka,35 A. Polini,23b C. S. Pollard,44 V. Polychronakos,29 D. Ponomarenko,110 L. Pontecorvo,35 G. A. Popeneciu,27d D. M. Portillo Quintero,133 S. Pospisil,139 K. Potamianos,44 I. N. Potrap,77 C. J. Potter,31 H. Potti,11 T. Poulsen,94 J. Poveda,35 T. D. Powell,146 M. E. Pozo Astigarraga,35 P. Pralavorio,99 S. Prell,76 D. Price,98 M. Primavera,65a S. Prince,101 M. L. Proffitt,145 N. Proklova,110 K. Prokofiev,61c F. Prokoshin,144b S. Protopopescu,29 J. Proudfoot,6 M. Przybycien,81a A. Puri,170 P. Puzo,129 J. Qian,103 Y. Qin,98 A. Quadt,51 M. Queitsch-Maitland,44 A. Qureshi,1 P. Rados,102 F. Ragusa,66a,66b G. Rahal,95 J. A. Raine,52 S. Rajagopalan,29 A. Ramirez Morales,90 K. Ran,15a T. Rashid,129 S. Raspopov,5 M. G. Ratti,66a,66b D. M. Rauch,44 F. Rauscher,112 S. Rave,97 B. Ravina,146 I. Ravinovich,177 J. H. Rawling,98 M. Raymond,35 A. L. Read,131 N. P. Readioff,56 M. Reale,65a,65b D. M. Rebuzzi,68a,68b A. Redelbach,174 G. Redlinger,29 R. Reece,143 R. G. Reed,32c K. Reeves,42 L. Rehnisch,19 J. Reichert,134 D. Reikher,158 A. Reiss,97 A. Rej,148 C. Rembser,35 H. Ren,15d M. Rescigno,70a S. Resconi,66a E. D. Resseguie,134 S. Rettie,172 E. Reynolds,21 O. L. Rezanova,120b,120a P. Reznicek,140 E. Ricci,73a,73b R. Richter,113 S. Richter,44 E. Richter-Was,81b O. Ricken,24 M. Ridel,133 P. Rieck,113 C. J. Riegel,179 O. Rifki,44 M. Rijssenbeek,152 A. Rimoldi,68a,68b M. Rimoldi,20 L. Rinaldi,23b G. Ripellino,151 B. Ristić,87 E. Ritsch,35 I. Riu,14 J. C. Rivera Vergara,144a F. Rizatdinova,126 E. Rizvi,90 C. Rizzi,14 R. T. Roberts,98 S. H. Robertson,101,o D. Robinson,31 J. E. M. Robinson,44 A. Robson,55 E. Rocco,97 C. Roda,69a,69b Y. Rodina,99 S. Rodriguez Bosca,171 A. Rodriguez Perez,14 D. Rodriguez Rodriguez,171 A. M. Rodríguez Vera,165b S. Roe,35 C. S. Rogan,57 O. Røhne,131 R. Röhrig,113 C. P. A. Roland,63 J. Roloff,57 A. Romaniouk,110 M. Romano,23b,23a N. Rompotis,88 M. Ronzani,122 L. Roos,133 S. Rosati,70a K. Rosbach,50 N-A. Rosien,51 B. J. Rosser,134 E. Rossi,44 E. Rossi,72a,72b E. Rossi,67a,67b L. P. Rossi,53b L. Rossini,66a,66b J. H. N. Rosten,31 R. Rosten,14 M. Rotaru,27b J. Rothberg,145 D. Rousseau,129 D. Roy,32c A. Rozanov,99 Y. Rozen,157 X. Ruan,32c F. Rubbo,150 F. Rühr,50 A. Ruiz-Martinez,171 Z. Rurikova,50 N. A. Rusakovich,77 H. L. Russell,101 J. P. Rutherfoord,7 E. M. Rüttinger,44,qq Y. F. Ryabov,135 M. Rybar,38 G. Rybkin,129 S. Ryu,6 A. Ryzhov,121 G. F. Rzehorz,51 P. Sabatini,51 G. Sabato,118 S. Sacerdoti,129 H. F-W. Sadrozinski,143 R. Sadykov,77 F. Safai Tehrani,70a P. Saha,119 M. Sahinsoy,59a A. Sahu,179 M. Saimpert,44 M. Saito,160 T. Saito,160 H. Sakamoto,160 A. Sakharov,122,hh D. Salamani,52 G. Salamanna,72a,72b J. E. Salazar Loyola,144b P. H. Sales De Bruin,169 D. Salihagic,113 A. Salnikov,150 J. Salt,171 D. Salvatore,40b,40a F. Salvatore,153 A. Salvucci,61a,61b,61c A. Salzburger,35 J. Samarati,35 D. Sammel,50 D. Sampsonidis,159 D. Sampsonidou,159 J. Sánchez,171 A. Sanchez Pineda,64a,64c H. Sandaker,131 C. O. Sander,44 M. Sandhoff,179 C. Sandoval,22 151801-12 PHYSICAL REVIEW LETTERS 122, 151801 (2019) D. P. C. Sankey,141 M. Sannino,53b,53a Y. Sano,115 A. Sansoni,49 C. Santoni,37 H. Santos,137a I. Santoyo Castillo,153 A. Santra,171 A. Sapronov,77 J. G. Saraiva,137a,137d O. Sasaki,79 K. Sato,166 E. Sauvan,5 P. Savard,164,f N. Savic,113 R. Sawada,160 C. Sawyer,141 L. Sawyer,93,w C. Sbarra,23b A. Sbrizzi,23a T. Scanlon,92 J. Schaarschmidt,145 P. Schacht,113 B. M. Schachtner,112 D. Schaefer,36 L. Schaefer,134 J. Schaeffer,97 S. Schaepe,35 U. Schäfer,97 A. C. Schaffer,129 D. Schaile,112 R. D. Schamberger,152 N. Scharmberg,98 V. A. Schegelsky,135 D. Scheirich,140 F. Schenck,19 M. Schernau,168 C. Schiavi,53b,53a S. Schier,143 L. K. Schildgen,24 Z. M. Schillaci,26 E. J. Schioppa,35 M. Schioppa,40b,40a K. E. Schleicher,50 S. Schlenker,35 K. R. Schmidt-Sommerfeld,113 K. Schmieden,35 C. Schmitt,97 S. Schmitt,44 S. Schmitz,97 J. C. Schmoeckel,44 U. Schnoor,50 L. Schoeffel,142 A. Schoening,59b E. Schopf,132 M. Schott,97 J. F. P. Schouwenberg,117 J. Schovancova,35 S. Schramm,52 A. Schulte,97 H-C. Schultz-Coulon,59a M. Schumacher,50 B. A. Schumm,143 Ph. Schune,142 A. Schwartzman,150 T. A. Schwarz,103 Ph. Schwemling,142 R. Schwienhorst,104 A. Sciandra,24 G. Sciolla,26 M. Scornajenghi,40b,40a F. Scuri,69a F. Scutti,102 L. M. Scyboz,113 C. D. Sebastiani,70a,70b P. Seema,19 S. C. Seidel,116 A. Seiden,143 T. Seiss,36 J. M. Seixas,78b G. Sekhniaidze,67a K. Sekhon,103 S. J. Sekula,41 N. Semprini-Cesari,23b,23a S. Sen,47 S. Senkin,37 C. Serfon,131 L. Serin,129 L. Serkin,64a,64b M. Sessa,58a H. Severini,125 F. Sforza,167 A. Sfyrla,52 E. Shabalina,51 J. D. Shahinian,143 N. W. Shaikh,43a,43b D. Shaked Renous,177 L. Y. Shan,15a R. Shang,170 J. T. Shank,25 M. Shapiro,18 A. S. Sharma,1 A. Sharma,132 P. B. Shatalov,109 K. Shaw,153 S. M. Shaw,98 A. Shcherbakova,135 Y. Shen,125 N. Sherafati,33 A. D. Sherman,25 P. Sherwood,92 L. Shi,155,rr S. Shimizu,79 C. O. Shimmin,180 Y. Shimogama,176 M. Shimojima,114 I. P. J. Shipsey,132 S. Shirabe,85 M. Shiyakova,77 J. Shlomi,177 A. Shmeleva,108 D. Shoaleh Saadi,107 M. J. Shochet,36 S. Shojaii,102 D. R. Shope,125 S. Shrestha,123 E. Shulga,110 P. Sicho,138 A. M. Sickles,170 P. E. Sidebo,151 E. Sideras Haddad,32c O. Sidiropoulou,35 A. Sidoti,23b,23a F. Siegert,46 Dj. Sijacki,16 J. Silva,137a M. Silva Jr.,178 M. V. Silva Oliveira,78a S. B. Silverstein,43a S. Simion,129 E. Simioni,97 M. Simon,97 R. Simoniello,97 P. Sinervo,164 N. B. Sinev,128 M. Sioli,23b,23a I. Siral,103 S. Yu. Sivoklokov,111 J. Sjölin,43a,43b P. Skubic,125 M. Slater,21 T. Slavicek,139 M. Slawinska,82 K. Sliwa,167 R. Slovak,140 V. Smakhtin,177 B. H. Smart,5 J. Smiesko,28a N. Smirnov,110 S. Yu. Smirnov,110 Y. Smirnov,110 L. N. Smirnova,111 O. Smirnova,94 J. W. Smith,51 M. Smizanska,87 K. Smolek,139 A. Smykiewicz,82 A. A. Snesarev,108 I. M. Snyder,128 S. Snyder,29 R. Sobie,173,o A. M. Soffa,168 A. Soffer,158 A. Søgaard,48 D. A. Soh,155 G. Sokhrannyi,89 C. A. Solans Sanchez,35 M. Solar,139 E. Yu. Soldatov,110 U. Soldevila,171 A. A. Solodkov,121 A. Soloshenko,77 O. V. Solovyanov,121 V. Solovyev,135 P. Sommer,146 H. Son,167 W. Song,141 W. Y. Song,165b A. Sopczak,139 F. Sopkova,28b C. L. Sotiropoulou,69a,69b S. Sottocornola,68a,68b R. Soualah,64a,64c,ss A. M. Soukharev,120b,120a D. South,44 B. C. Sowden,91 S. Spagnolo,65a,65b M. Spalla,113 M. Spangenberg,175 F. Spanò,91 D. Sperlich,19 T. M. Spieker,59a R. Spighi,23b G. Spigo,35 L. A. Spiller,102 D. P. Spiteri,55 M. Spousta,140 A. Stabile,66a,66b R. Stamen,59a S. Stamm,19 E. Stanecka,82 R. W. Stanek,6 C. Stanescu,72a B. Stanislaus,132 M. M. Stanitzki,44 B. Stapf,118 S. Stapnes,131 E. A. Starchenko,121 G. H. Stark,36 J. Stark,56 S. H Stark,39 P. Staroba,138 P. Starovoitov,59a S. Stärz,35 R. Staszewski,82 M. Stegler,44 P. Steinberg,29 B. Stelzer,149 H. J. Stelzer,35 O. Stelzer-Chilton,165a H. Stenzel,54 T. J. Stevenson,90 G. A. Stewart,35 M. C. Stockton,35 G. Stoicea,27b P. Stolte,51 S. Stonjek,113 A. Straessner,46 J. Strandberg,151 S. Strandberg,43a,43b M. Strauss,125 P. Strizenec,28b R. Ströhmer,174 D. M. Strom,128 R. Stroynowski,41 A. Strubig,48 S. A. Stucci,29 B. Stugu,17 J. Stupak,125 N. A. Styles,44 D. Su,150 J. Su,136 S. Suchek,59a Y. Sugaya,130 M. Suk,139 V. V. Sulin,108 M. J. Sullivan,88 D. M. S. Sultan,52 S. Sultansoy,4c T. Sumida,83 S. Sun,103 X. Sun,3 K. Suruliz,153 C. J. E. Suster,154 M. R. Sutton,153 S. Suzuki,79 M. Svatos,138 M. Swiatlowski,36 S. P. Swift,2 A. Sydorenko,97 I. Sykora,28a T. Sykora,140 D. Ta,97 K. Tackmann,44,tt J. Taenzer,158 A. Taffard,168 R. Tafirout,165a E. Tahirovic,90 N. Taiblum,158 H. Takai,29 R. Takashima,84 E. H. Takasugi,113 K. Takeda,80 T. Takeshita,147 Y. Takubo,79 M. Talby,99 A. A. Talyshev,120b,120a J. Tanaka,160 M. Tanaka,162 R. Tanaka,129 B. B. Tannenwald,123 S. Tapia Araya,144b S. Tapprogge,97 A. Tarek Abouelfadl Mohamed,133 S. Tarem,157 G. Tarna,27b,r G. F. Tartarelli,66a P. Tas,140 M. Tasevsky,138 T. Tashiro,83 E. Tassi,40b,40a A. Tavares Delgado,137a,137b Y. Tayalati,34e A. C. Taylor,116 A. J. Taylor,48 G. N. Taylor,102 P. T. E. Taylor,102 W. Taylor,165b A. S. Tee,87 R. Teixeira De Lima,150 P. Teixeira-Dias,91 H. Ten Kate,35 J. J. Teoh,118 S. Terada,79 K. Terashi,160 J. Terron,96 S. Terzo,14 M. Testa,49 R. J. Teuscher,164,o S. J. Thais,180 T. Theveneaux-Pelzer,44 F. Thiele,39 D. W. Thomas,91 J. P. Thomas,21 A. S. Thompson,55 P. D. Thompson,21 L. A. Thomsen,180 E. Thomson,134 Y. Tian,38 R. E. Ticse Torres,51 V. O. Tikhomirov,108,uu Yu. A. Tikhonov,120b,120a S. Timoshenko,110 P. Tipton,180 S. Tisserant,99 K. Todome,162 S. Todorova-Nova,5 S. Todt,46 J. Tojo,85 S. Tokár,28a K. Tokushuku,79 E. Tolley,123 K. G. Tomiwa,32c M. Tomoto,115 L. Tompkins,150,gg K. Toms,116 B. Tong,57 P. Tornambe,50 E. Torrence,128 H. Torres,46 E. Torró Pastor,145 C. Tosciri,132 J. Toth,99,vv F. Touchard,99 D. R. Tovey,146 C. J. Treado,122 T. Trefzger,174 F. Tresoldi,153 A. Tricoli,29 I. M. Trigger,165a 151801-13 PHYSICAL REVIEW LETTERS 122, 151801 (2019) S. Trincaz-Duvoid,133 M. F. Tripiana,14 W. Trischuk,164 B. Trocmé,56 A. Trofymov,129 C. Troncon,66a M. Trovatelli,173 F. Trovato,153 L. Truong,32b M. Trzebinski,82 A. Trzupek,82 F. Tsai,44 J. C-L. Tseng,132 P. V. Tsiareshka,105,ii A. Tsirigotis,159 N. Tsirintanis,9 V. Tsiskaridze,152 E. G. Tskhadadze,156a I. I. Tsukerman,109 V. Tsulaia,18 S. Tsuno,79 D. Tsybychev,152,163 Y. Tu,61b A. Tudorache,27b V. Tudorache,27b T. T. Tulbure,27a A. N. Tuna,57 S. Turchikhin,77 D. Turgeman,177 I. Turk Cakir,4b,ww R. Turra,66a P. M. Tuts,38 E. Tzovara,97 G. Ucchielli,45 I. Ueda,79 M. Ughetto,43a,43b F. Ukegawa,166 G. Unal,35 A. Undrus,29 G. Unel,168 F. C. Ungaro,102 Y. Unno,79 K. Uno,160 J. Urban,28b P. Urquijo,102 P. Urrejola,97 G. Usai,8 J. Usui,79 L. Vacavant,99 V. Vacek,139 B. Vachon,101 K. O. H. Vadla,131 A. Vaidya,92 C. Valderanis,112 E. Valdes Santurio,43a,43b M. Valente,52 S. Valentinetti,23b,23a A. Valero,171 L. Valéry,44 R. A. Vallance,21 A. Vallier,5 J. A. Valls Ferrer,171 T. R. Van Daalen,14 H. Van der Graaf,118 P. Van Gemmeren,6 I. Van Vulpen,118 M. Vanadia,71a,71b W. Vandelli,35 A. Vaniachine,163 P. Vankov,118 R. Vari,70a E. W. Varnes,7 C. Varni,53b,53a T. Varol,41 D. Varouchas,129 K. E. Varvell,154 G. A. Vasquez,144b J. G. Vasquez,180 F. Vazeille,37 D. Vazquez Furelos,14 T. Vazquez Schroeder,35 J. Veatch,51 V. Vecchio,72a,72b L. M. Veloce,164 F. Veloso,137a,137c S. Veneziano,70a A. Ventura,65a,65b N. Venturi,35 V. Vercesi,68a M. Verducci,72a,72b C. M. Vergel Infante,76 C. Vergis,24 W. Verkerke,118 A. T. Vermeulen,118 J. C. Vermeulen,118 M. C. Vetterli,149,f N. Viaux Maira,144b M. Vicente Barreto Pinto,52 I. Vichou,170,a T. Vickey,146 O. E. Vickey Boeriu,146 G. H. A. Viehhauser,132 S. Viel,18 L. Vigani,132 M. Villa,23b,23a M. Villaplana Perez,66a,66b E. Vilucchi,49 M. G. Vincter,33 V. B. Vinogradov,77 A. Vishwakarma,44 C. Vittori,23b,23a I. Vivarelli,153 S. Vlachos,10 M. Vogel,179 P. Vokac,139 G. Volpi,14 S. E. von Buddenbrock,32c E. Von Toerne,24 V. Vorobel,140 K. Vorobev,110 M. Vos,171 J. H. Vossebeld,88 N. Vranjes,16 M. Vranjes Milosavljevic,16 V. Vrba,139 M. Vreeswijk,118 T. Šfiligoj,89 R. Vuillermet,35 I. Vukotic,36 T. Ženiš,28a L. Živković,16 P. Wagner,24 W. Wagner,179 J. Wagner-Kuhr,112 H. Wahlberg,86 S. Wahrmund,46 K. Wakamiya,80 V. M. Walbrecht,113 J. Walder,87 R. Walker,112 S. D. Walker,91 W. Walkowiak,148 V. Wallangen,43a,43b A. M. Wang,57 C. Wang,58b F. Wang,178 H. Wang,18 H. Wang,3 J. Wang,154 J. Wang,59b P. Wang,41 Q. Wang,125 R.-J. Wang,133 R. Wang,58a R. Wang,6 S. M. Wang,155 W. T. Wang,58a W. Wang,15c,xx W. X. Wang,58a,xx Y. Wang,58a,kk Z. Wang,58c C. Wanotayaroj,44 A. Warburton,101 C. P. Ward,31 D. R. Wardrope,92 A. Washbrook,48 P. M. Watkins,21 A. T. Watson,21 M. F. Watson,21 G. Watts,145 S. Watts,98 B. M. Waugh,92 A. F. Webb,11 S. Webb,97 C. Weber,180 M. S. Weber,20 S. A. Weber,33 S. M. Weber,59a A. R. Weidberg,132 J. Weingarten,45 M. Weirich,97 C. Weiser,50 P. S. Wells,35 T. Wenaus,29 T. Wengler,35 S. Wenig,35 N. Wermes,24 M. D. Werner,76 P. Werner,35 M. Wessels,59a T. D. Weston,20 K. Whalen,128 N. L. Whallon,145 A. M. Wharton,87 A. S. White,103 A. White,8 M. J. White,1 R. White,144b D. Whiteson,168 B. W. Whitmore,87 F. J. Wickens,141 W. Wiedenmann,178 M. Wielers,141 C. Wiglesworth,39 L. A. M. Wiik-Fuchs,50 F. Wilk,98 H. G. Wilkens,35 L. J. Wilkins,91 H. H. Williams,134 S. Williams,31 C. Willis,104 S. Willocq,100 J. A. Wilson,21 I. Wingerter-Seez,5 E. Winkels,153 F. Winklmeier,128 O. J. Winston,153 B. T. Winter,50 M. Wittgen,150 M. Wobisch,93 A. Wolf,97 T. M. H. Wolf,118 R. Wolff,99 M. W. Wolter,82 H. Wolters,137a,137c V. W. S. Wong,172 N. L. Woods,143 S. D. Worm,21 B. K. Wosiek,82 K. W. Woźniak,82 K. Wraight,55 M. Wu,36 S. L. Wu,178 X. Wu,52 Y. Wu,58a T. R. Wyatt,98 B. M. Wynne,48 S. Xella,39 Z. Xi,103 L. Xia,175 D. Xu,15a H. Xu,58a,r L. Xu,29 T. Xu,142 W. Xu,103 Z. Xu,150 B. Yabsley,154 S. Yacoob,32a K. Yajima,130 D. P. Yallup,92 D. Yamaguchi,162 Y. Yamaguchi,162 A. Yamamoto,79 T. Yamanaka,160 F. Yamane,80 M. Yamatani,160 T. Yamazaki,160 Y. Yamazaki,80 Z. Yan,25 H. J. Yang,58c,58d H. T. Yang,18 S. Yang,75 Y. Yang,160 Z. Yang,17 W-M. Yao,18 Y. C. Yap,44 Y. Yasu,79 E. Yatsenko,58c,58d J. Ye,41 S. Ye,29 I. Yeletskikh,77 E. Yigitbasi,25 E. Yildirim,97 K. Yorita,176 K. Yoshihara,134 C. J. S. Young,35 C. Young,150 J. Yu,8 J. Yu,76 X. Yue,59a S. P. Y. Yuen,24 B. Zabinski,82 G. Zacharis,10 E. Zaffaroni,52 R. Zaidan,14 A. M. Zaitsev,121,oo T. Zakareishvili,156b N. Zakharchuk,33 J. Zalieckas,17 S. Zambito,57 D. Zanzi,35 D. R. Zaripovas,55 S. V. Zeißner,45 C. Zeitnitz,179 G. Zemaityte,132 J. C. Zeng,170 Q. Zeng,150 O. Zenin,121 D. Zerwas,129 M. Zgubič,132 D. F. Zhang,58b D. Zhang,103 F. Zhang,178 G. Zhang,58a G. Zhang,15b H. Zhang,15c J. Zhang,6 L. Zhang,15c L. Zhang,58a M. Zhang,170 P. Zhang,15c R. Zhang,58a R. Zhang,24 X. Zhang,58b Y. Zhang,15d Z. Zhang,129 P. Zhao,47 Y. Zhao,58b,129,aa Z. Zhao,58a A. Zhemchugov,77 Z. Zheng,103 D. Zhong,170 B. Zhou,103 C. Zhou,178 L. Zhou,41 M. S. Zhou,15d M. Zhou,152 N. Zhou,58c Y. Zhou,7 C. G. Zhu,58b H. L. Zhu,58a H. Zhu,15a J. Zhu,103 Y. Zhu,58a X. Zhuang,15a K. Zhukov,108 V. Zhulanov,120b,120a A. Zibell,174 D. Zieminska,63 N. I. Zimine,77 S. Zimmermann,50 Z. Zinonos,113 M. Ziolkowski,148 G. Zobernig,178 A. Zoccoli,23b,23a K. Zoch,51 T. G. Zorbas,146 R. Zou,36 M. Zur Nedden,19 and L. Zwalinski35 (ATLAS Collaboration) 151801-14 PHYSICAL REVIEW LETTERS 122, 151801 (2019) 1 Department of Physics, University of Adelaide, Adelaide, Australia 2 Physics Department, SUNY Albany, Albany, New York, USA 3 Department of Physics, University of Alberta, Edmonton, Alberta, Canada 4a Department of Physics, Ankara University, Ankara, Turkey 4b Istanbul Aydin University, Istanbul, Turkey 4c Division of Physics, TOBB University of Economics and Technology, Ankara, Turkey 5 LAPP, Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS/IN2P3, Annecy, France 6 High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois, USA 7 Department of Physics, University of Arizona, Tucson, Arizona, USA 8 Department of Physics, University of Texas at Arlington, Arlington, Texas, USA 9 Physics Department, National and Kapodistrian University of Athens, Athens, Greece 10 Physics Department, National Technical University of Athens, Zografou, Greece 11 Department of Physics, University of Texas at Austin, Austin, Texas, USA 12a Bahcesehir University, Faculty of Engineering and Natural Sciences, Istanbul, Turkey 12b Istanbul Bilgi University, Faculty of Engineering and Natural Sciences, Istanbul, Turkey 12c Department of Physics, Bogazici University, Istanbul, Turkey 12d Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey 13 Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan 14 Institut de Física d’Altes Energies (IFAE), Barcelona Institute of Science and Technology, Barcelona, Spain 15a Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China 15b Physics Department, Tsinghua University, Beijing, China 15c Department of Physics, Nanjing University, Nanjing, China 15d University of Chinese Academy of Science (UCAS), Beijing, China 16 Institute of Physics, University of Belgrade, Belgrade, Serbia 17 Department for Physics and Technology, University of Bergen, Bergen, Norway 18 Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, California, USA 19 Institut für Physik, Humboldt Universität zu Berlin, Berlin, Germany 20 Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland 21 School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom 22 Centro de Investigaciónes, Universidad Antonio Nariño, Bogota, Colombia 23a Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy 23b INFN Sezione di Bologna, Italy 24 Physikalisches Institut, Universität Bonn, Bonn, Germany 25 Department of Physics, Boston University, Boston, Massachusetts, USA 26 Department of Physics, Brandeis University, Waltham, Massachusetts, USA 27a Transilvania University of Brasov, Brasov, Romania 27b Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania 27c Department of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania 27d National Institute for Research and Development of Isotopic and Molecular Technologies, Physics Department, Cluj-Napoca, Romania 27e University Politehnica Bucharest, Bucharest, Romania 27f West University in Timisoara, Timisoara, Romania 28a Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovak Republic 28b Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic 29 Physics Department, Brookhaven National Laboratory, Upton, New York, USA 30 Departamento de Física, Universidad de Buenos Aires, Buenos Aires, Argentina 31 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom 32a Department of Physics, University of Cape Town, Cape Town, South Africa 32b Department of Mechanical Engineering Science, University of Johannesburg, Johannesburg, South Africa 32c School of Physics, University of the Witwatersrand, Johannesburg, South Africa 33 Department of Physics, Carleton University, Ottawa, Ontario, Canada 34a Faculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies—Université Hassan II, Casablanca, Morocco 34b Centre National de l’Energie des Sciences Techniques Nucleaires (CNESTEN), Rabat, Morocco 34c Faculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA-Marrakech, Morocco 34d Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco 34e Faculté des sciences, Université Mohammed V, Rabat, Morocco 35 CERN, Geneva, Switzerland 36 Enrico Fermi Institute, University of Chicago, Chicago, Illinois, USA 151801-15 PHYSICAL REVIEW LETTERS 122, 151801 (2019) 37 LPC, Université Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand, France 38 Nevis Laboratory, Columbia University, Irvington, New York, USA 39 Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark 40a Dipartimento di Fisica, Università della Calabria, Rende, Italy 40b INFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati, Italy 41 Physics Department, Southern Methodist University, Dallas, Texas, USA 42 Physics Department, University of Texas at Dallas, Richardson, Texas, USA 43a Department of Physics, Stockholm University, Sweden 43b Oskar Klein Centre, Stockholm, Sweden 44 Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany 45 Lehrstuhl für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, Germany 46 Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany 47 Department of Physics, Duke University, Durham, North Carolina, USA 48 SUPA—School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom 49 INFN e Laboratori Nazionali di Frascati, Frascati, Italy 50 Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany 51 II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany 52 Département de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, Switzerland 53a Dipartimento di Fisica, Università di Genova, Genova, Italy 53b INFN Sezione di Genova, Italy 54 II. Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany 55 SUPA—School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom 56 LPSC, Université Grenoble Alpes, CNRS/IN2P3, Grenoble INP, Grenoble, France 57 Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, Massachusetts, USA 58a Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, China 58b Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Qingdao, China 58c School of Physics and Astronomy, Shanghai Jiao Tong University, KLPPAC-MoE, SKLPPC, Shanghai, China 58d Tsung-Dao Lee Institute, Shanghai, China 59a Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany 59b Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany 60 Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima, Japan 61a Department of Physics, Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China 61b Department of Physics, University of Hong Kong, Hong Kong, China 61c Department of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China 62 Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 63 Department of Physics, Indiana University, Bloomington, Indiana, USA 64a INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy 64b ICTP, Trieste, Italy 64c Dipartimento di Chimica, Fisica e Ambiente, Università di Udine, Udine, Italy 65a INFN Sezione di Lecce, Italy 65b Dipartimento di Matematica e Fisica, Università del Salento, Lecce, Italy 66a INFN Sezione di Milano, Italy 66b Dipartimento di Fisica, Università di Milano, Milano, Italy 67a INFN Sezione di Napoli, Italy 67b Dipartimento di Fisica, Università di Napoli, Napoli, Italy 68a INFN Sezione di Pavia, Italy 68b Dipartimento di Fisica, Università di Pavia, Pavia, Italy 69a INFN Sezione di Pisa, Italy 69b Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy 70a INFN Sezione di Roma, Italy 70b Dipartimento di Fisica, Sapienza Università di Roma, Roma, Italy 71a INFN Sezione di Roma Tor Vergata, Italy 71b Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy 72a INFN Sezione di Roma Tre, Italy 72b Dipartimento di Matematica e Fisica, Università Roma Tre, Roma, Italy 73a INFN-TIFPA, Italy 73b Università degli Studi di Trento, Trento, Italy 151801-16 PHYSICAL REVIEW LETTERS 122, 151801 (2019) 74 Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, Austria 75 University of Iowa, Iowa City, Iowa, USA 76 Department of Physics and Astronomy, Iowa State University, Ames, Iowa, USA 77 Joint Institute for Nuclear Research, Dubna, Russia 78a Departamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, Brazil 78b Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil 78c Universidade Federal de São João del Rei (UFSJ), São João del Rei, Brazil 78d Instituto de Física, Universidade de São Paulo, São Paulo, Brazil 79 KEK, High Energy Accelerator Research Organization, Tsukuba, Japan 80 Graduate School of Science, Kobe University, Kobe, Japan 81a AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, Poland 81b Marian Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland 82 Institute of Nuclear Physics Polish Academy of Sciences, Krakow, Poland 83 Faculty of Science, Kyoto University, Kyoto, Japan 84 Kyoto University of Education, Kyoto, Japan 85 Research Center for Advanced Particle Physics and Department of Physics, Kyushu University, Fukuoka, Japan 86 Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina 87 Physics Department, Lancaster University, Lancaster, United Kingdom 88 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom 89 Department of Experimental Particle Physics, Jožef Stefan Institute and Department of Physics, University of Ljubljana, Ljubljana, Slovenia 90 School of Physics and Astronomy, Queen Mary University of London, London, United Kingdom 91 Department of Physics, Royal Holloway University of London, Egham, United Kingdom 92 Department of Physics and Astronomy, University College London, London, United Kingdom 93 Louisiana Tech University, Ruston, Louisiana, USA 94 Fysiska institutionen, Lunds universitet, Lund, Sweden 95 Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), Villeurbanne, France 96 Departamento de Física Teorica C-15 and CIAFF, Universidad Autónoma de Madrid, Madrid, Spain 97 Institut für Physik, Universität Mainz, Mainz, Germany 98 School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom 99 CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France 100 Department of Physics, University of Massachusetts, Amherst, Massachusetts, USA 101 Department of Physics, McGill University, Montreal, Quebec, Canada 102 School of Physics, University of Melbourne, Victoria, Australia 103 Department of Physics, University of Michigan, Ann Arbor, Michigan, USA 104 Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan, USA 105 B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus 106 Research Institute for Nuclear Problems of Byelorussian State University, Minsk, Belarus 107 Group of Particle Physics, University of Montreal, Montreal, Quebec, Canada 108 P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia 109 Institute for Theoretical and Experimental Physics (ITEP), Moscow, Russia 110 National Research Nuclear University MEPhI, Moscow, Russia 111 D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, Russia 112 Fakultät für Physik, Ludwig-Maximilians-Universität München, München, Germany 113 Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, Germany 114 Nagasaki Institute of Applied Science, Nagasaki, Japan 115 Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Japan 116 Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico, USA 117 Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, Netherlands 118 Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, Netherlands 119 Department of Physics, Northern Illinois University, DeKalb, Illinois, USA 120a Budker Institute of Nuclear Physics and NSU, SB RAS, Novosibirsk, Russia 120b Novosibirsk State University Novosibirsk, Russia 121 Institute for High Energy Physics of the National Research Centre Kurchatov Institute, Protvino, Russia 122 Department of Physics, New York University, New York, New York, USA 123 Ohio State University, Columbus, Ohio, USA 124 Faculty of Science, Okayama University, Okayama, Japan 125 Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma, USA 126 Department of Physics, Oklahoma State University, Stillwater, Oklahoma, USA 127 Palacký University, RCPTM, Joint Laboratory of Optics, Olomouc, Czech Republic 151801-17 PHYSICAL REVIEW LETTERS 122, 151801 (2019) 128 Center for High Energy Physics, University of Oregon, Eugene, Oregon, USA 129 LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France 130 Graduate School of Science, Osaka University, Osaka, Japan 131 Department of Physics, University of Oslo, Oslo, Norway 132 Department of Physics, Oxford University, Oxford, United Kingdom 133 LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France 134 Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania, USA 135 Konstantinov Nuclear Physics Institute of National Research Centre “Kurchatov Institute”, PNPI, St. Petersburg, Russia 136 Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania, USA 137a Laboratório de Instrumentação e Física Experimental de Partículas—LIP, Portugal 137b Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal 137c Departamento de Física, Universidade de Coimbra, Coimbra, Portugal 137d Centro de Física Nuclear da Universidade de Lisboa, Lisboa, Portugal 137e Departamento de Física, Universidade do Minho, Braga, Portugal 137f Departamento de Física Teorica y del Cosmos, Universidad de Granada, Granada (Spain), Spain 137g Dep Física and CEFITEC of Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal 138 Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic 139 Czech Technical University in Prague, Prague, Czech Republic 140 Charles University, Faculty of Mathematics and Physics, Prague, Czech Republic 141 Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom 142 IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France 143 Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, California, USA 144a Departamento de Física, Pontificia Universidad Católica de Chile, Santiago, Chile 144b Departamento de Física, Universidad Técnica Federico Santa María, Valparaíso, Chile 145 Department of Physics, University of Washington, Seattle, Washington, USA 146 Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom 147 Department of Physics, Shinshu University, Nagano, Japan 148 Department Physik, Universität Siegen, Siegen, Germany 149 Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada 150 SLAC National Accelerator Laboratory, Stanford, California, USA 151 Physics Department, Royal Institute of Technology, Stockholm, Sweden 152 Departments of Physics and Astronomy, Stony Brook University, Stony Brook, New York, USA 153 Department of Physics and Astronomy, University of Sussex, Brighton, United Kingdom 154 School of Physics, University of Sydney, Sydney, Australia 155 Institute of Physics, Academia Sinica, Taipei, Taiwan 156a E. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, Georgia 156b High Energy Physics Institute, Tbilisi State University, Tbilisi, Georgia 157 Department of Physics, Technion, Israel Institute of Technology, Haifa, Israel 158 Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel 159 Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece 160 International Center for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan 161 Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan 162 Department of Physics, Tokyo Institute of Technology, Tokyo, Japan 163 Tomsk State University, Tomsk, Russia 164 Department of Physics, University of Toronto, Toronto, Ontario, Canada 165a TRIUMF, Vancouver, British Columbia, Canada 165b Department of Physics and Astronomy, York University, Toronto, Ontario, Canada 166 Division of Physics and Tomonaga Center for the History of the Universe, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan 167 Department of Physics and Astronomy, Tufts University, Medford, Massachusetts, USA 168 Department of Physics and Astronomy, University of California Irvine, Irvine, California, USA 169 Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden 170 Department of Physics, University of Illinois, Urbana, Illinois, USA 171 Instituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain 172 Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada 173 Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, Canada 174 Fakultät für Physik und Astronomie, Julius-Maximilians-Universität Würzburg, Würzburg, Germany 175 Department of Physics, University of Warwick, Coventry, United Kingdom 176 Waseda University, Tokyo, Japan 177 Department of Particle Physics, Weizmann Institute of Science, Rehovot, Israel 151801-18 PHYSICAL REVIEW LETTERS 122, 151801 (2019) 178 Department of Physics, University of Wisconsin, Madison, Wisconsin, USA 179 Fakultät für Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universität Wuppertal, Wuppertal, Germany 180 Department of Physics, Yale University, New Haven, Connecticut, USA 181 Yerevan Physics Institute, Yerevan, Armenia a Deceased. b Also at Department of Physics, King’s College London, London, United Kingdom. c Also at Istanbul University, Department of Physics, Istanbul, Turkey. d Also at Instituto de Física Teórica de la Universidad Autónoma de Madrid, Spain. e Also at Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan. f Also at TRIUMF, Vancouver, British Columbia, Canada. g Also at Department of Physics and Astronomy, University of Louisville, Louisville, Kentucky, USA. h Also at Department of Physics, California State University, Fresno, California, USA. i Also at Department of Physics, University of Fribourg, Fribourg, Switzerland. j Also at Departament de Fisica de la Universitat Autonoma de Barcelona, Barcelona, Spain. k Also at Tomsk State University, Tomsk, and Moscow Institute of Physics and Technology State University, Dolgoprudny, Russia. l Also at The Collaborative Innovation Center of Quantum Matter (CICQM), Beijing, China. m Also at Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal. n Also at Universita di Napoli Parthenope, Napoli, Italy. o Also at Institute of Particle Physics (IPP), Canada. p Also at II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany. q Also at Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania. r Also at CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France. s Also at Department of Physics, St. Petersburg State Polytechnical University, St. Petersburg, Russia. t Also at Borough of Manhattan Community College, City University of New York, New York, USA. u Also at Department of Financial and Management Engineering, University of the Aegean, Chios, Greece. v Also at Centre for High Performance Computing, CSIR Campus, Rosebank, Cape Town, South Africa. w Also at Louisiana Tech University, Ruston, Louisiana, USA. x Also at California State University, East Bay, USA. y Also at Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona, Spain. z Also at Department of Physics, University of Michigan, Ann Arbor, Michigan, USA. aa Also at LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France. bb Also at Graduate School of Science, Osaka University, Osaka, Japan. cc Also at Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany. dd Also at Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, Netherlands. ee Also at Institute of Theoretical Physics, Ilia State University, Tbilisi, Georgia. ff Also at CERN, Geneva, Switzerland. gg Also at Department of Physics, Stanford University, USA. hh Also at Manhattan College, New York, New York, USA. ii Also at Joint Institute for Nuclear Research, Dubna, Russia. jj Also at Hellenic Open University, Patras, Greece. kk Also at LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France. ll Also at The City College of New York, New York, New York, USA. mm Also at Departamento de Física Teorica y del Cosmos, Universidad de Granada, Granada (Spain), Spain. nn Also at Department of Physics, California State University, Sacramento, California, USA. oo Also at Moscow Institute of Physics and Technology State University, Dolgoprudny, Russia. pp Also at Département de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, Switzerland. qq Also at Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom. rr Also at School of Physics, Sun Yat-sen University, Guangzhou, China. ss Also at Department of Applied Physics and Astronomy, University of Sharjah, Sharjah, United Arab Emirates. tt Also at Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany. uu Also at National Research Nuclear University MEPhI, Moscow, Russia. vv Also at Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Budapest, Hungary. ww Also at Giresun University, Faculty of Engineering, Giresun, Turkey. xx Also at Institute of Physics, Academia Sinica, Taipei, Taiwan. 151801-19