What RK and Q 5 can tell us about New Physics in b→sℓℓ transitions?
Algueró, Marcel (Universitat Autònoma de Barcelona. Departament de Física)
Capdevila, Bernat (Universitat Autònoma de Barcelona. Departament de Física)
Descotes-Genon, Sébastien (Université Paris-Saclay. Laboratoire de Physique Théorique)
Masjuan, Pere (Universitat Autònoma de Barcelona. Departament de Física)
Matias Espona, Joaquim (Institut de Física d'Altes Energies)

Date:	2019
Abstract:	The deviations with respect to the Standard Model that are currently observed in b → sℓℓ transitions, or B anomalies, can be interpreted in terms of different New Physics (NP) scenarios within a model-independent effective approach. We identify a set of internal tensions of the fit that require further attention and whose theoretical or experimental nature could be determined with more data. In this landscape of NP, we discuss possible ways to discriminate among favoured NP hypotheses in the short term thanks to current and forthcoming observables. While an update of R should help to disentangle the type of NP we may be observing (Lepton-Flavour Universality Violating and/or Lepton Flavour Universal), additional observables, in particular Q, turn out to be central to determine which NP hypothesis should be preferred. We also analyse the preferences shown by the current global fit concerning various NP hypotheses, using two different tools: the behaviour of the pulls of individual observables under NP scenarios and the directions favoured by approximate quadratic parametrisations of the observables in terms of Wilson coefficients.
Grants:	European Commission 690575 European Commission 692194 European Commission 674896 Ministerio de Economía y Competitividad FPA 2017-86989-P Ministerio de Economía y Competitividad FPA 2014-55613-P Ministerio de Economía y Competitividad SEV-2012-0234
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Beyond standard model ; Effective field theories ; Heavy quark physics
Published in:	Journal of high energy physics, Vol. 2019, issue 7 (July 2019) , art. 96, ISSN 1029-8479

DOI: 10.1007/JHEP07(2019)096

36 p, 1.4 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Institut de Física d’Altes Energies (IFAE)
Articles > Research articles
Articles > Published articles