Search for long-lived particles in final states with displaced dimuon vertices in pp collisions at √s= 13 TeV with the ATLAS detector

0520701 - FZÚ 2020 RIV US eng J - Článek v odborném periodiku
Aaboud, M. - Aad, G. - Abbott, B. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … celkem 2910 autorů
Search for long-lived particles in final states with displaced dimuon vertices in pp collisions at √s= 13 TeV with the ATLAS detector.
Physical Review D. Roč. 99, č. 1 (2019), s. 1-32, č. článku 012001. ISSN 2470-0010. E-ISSN 2470-0029
Grant CEP: GA MŠMT LM2015058
Institucionální podpora: RVO:68378271
Klíčová slova: ATLAS * CERN LHC Coll * Higgs particle: radiative decay * Higgs particle: branching ratio * weak coupling
Obor OECD: Particles and field physics
Impakt faktor: 4.833, rok: 2019
Způsob publikování: Open access

A search is performed for a long-lived particle decaying into a final state that includes a pair of muons of opposite-sign electric charge, using proton-proton collision data collected at s=13  TeV by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 32.9  fb-1. No significant excess over the Standard Model expectation is observed. Limits at 95% confidence level on the lifetime of the long-lived particle are presented in models of new phenomena including gauge-mediated supersymmetry or decay of the Higgs boson, H, to a pair of dark photons, ZD. Lifetimes in the range cτ=1–2400  cm are excluded, depending on the parameters of the model. In the supersymmetric model, the lightest neutralino is the next-to-lightest supersymmetric particle, with a relatively long lifetime due to its weak coupling to the gravitino, the lightest supersymmetric particle.
Trvalý link: http://hdl.handle.net/11104/0305359