On broad Kaluza-Klein gluons
| Autor: | Emilio Royo, Mikel Mendizabal, Mariano Quirós, Rafel Escribano |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
High Energy Physics - Theory
Quark Nuclear and High Energy Physics Particle physics Top quark warped [space-time] composite [fermion] Physics beyond the Standard Model Kaluza–Klein theory FOS: Physical sciences QC770-798 pair production [top] 01 natural sciences High Energy Physics - Experiment Standard Model Kaluza-Klein [gluon] High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) Nuclear and particle physics. Atomic energy. Radioactivity 0103 physical sciences Phenomenology of Field Theories in Higher Dimensions ddc:530 010306 general physics numerical calculations higher-dimensional [space-time] space-time: higher-dimensional Physics right-handed [top] 010308 nuclear & particles physics CMS new physics High Energy Physics::Phenomenology Propagator ATLAS Gluon gluon: Kaluza-Klein High Energy Physics - Phenomenology fermion: composite CERN LHC Coll High Energy Physics - Theory (hep-th) Composite fermion High Energy Physics::Experiment top: right-handed space-time: warped top: pair production |
| Zdroj: | Journal of High Energy Physics Journal of High Energy Physics, Vol 2021, Iss 5, Pp 1-27 (2021) Journal of high energy physics 05(5), 121 (2021). doi:10.1007/JHEP05(2021)121 |
| DOI: | 10.1007/JHEP05(2021)121 |
| Popis: | Journal of high energy physics 05(5), 121 (2021). doi:10.1007/JHEP05(2021)121 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 $ t\overline{t} $, $ t\overline{t}W $, $ t\overline{t}Z $, $ t\overline{t}H $, and $ tt\overline{tt} $ 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 $ tt\overline{tt} $ 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. Published by SISSA, [Trieste] |
| Databáze: | OpenAIRE |
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