On broad Kaluza-Klein gluons
Escribano, Rafel (Institut de Física d'Altes Energies)
Mendizabal, Mikel (Deutsches Elektronen-Synchrotron)
Quiros, Mariano (Universitat Autònoma de Barcelona. Departament de Física)
Royo, Emilio (Institut de Física d'Altes Energies)

Date:	2021
Abstract:	In theories with a warped extra dimension, composite fermions, as e. g. the right-handed top quark, can be very strongly coupled to Kaluza-Klein (KK) fields. In particular, the KK gluons in the presence of such composite fields become very broad resonances, thus remarkably modifying their experimental signatures. We have computed the pole mass and the pole width of the KK gluon, triggered by its interaction with quarks, as well as the prediction for proton-proton cross-sections using the full propagator and compared it with that obtained from the usual Breit-Wigner approximation. We compare both approaches, along with the existing experimental data from ATLAS and CMS, for the tt¯, tt¯ W, tt¯ Z, tt¯ H, and tttt¯ channels. We have found differences between the two approaches of up to about 100%, highlighting that the effect of broad resonances can be dramatic on present, and mainly future, experimental searches. The channel tttt¯ is particularly promising because the size of the cross-section signal is of the same order of magnitude as the Standard Model prediction, and future experimental analyses in this channel, especially for broad resonances, can shed light on the nature of possible physics beyond the Standard Model.
Grants:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1069 Agencia Estatal de Investigación FPA2017-88915-P Agencia Estatal de Investigación FPA2017-86989-P Agencia Estatal de Investigación SEV-2016-0588 European Commission 824093
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:	Phenomenology of Field Theories in Higher Dimensions
Published in:	Journal of high energy physics, Vol. 2021 (May 2021) , art. 121, ISSN 1029-8479

DOI: 10.1007/JHEP05(2021)121

27 p, 1.9 MB

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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