Search for Higgs boson decays into a pair of pseudoscalar particles in the bbμμ final state with the ATLAS detector in pp collisions at √s =13 TeV

0565732 - FZÚ 2023 RIV US eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2901 authors
Search for Higgs boson decays into a pair of pseudoscalar particles in the bbμμ final state with the ATLAS detector in pp collisions at √s =13 TeV.
Physical Review D. Roč. 105, č. 1 (2022), č. článku 012006. ISSN 2470-0010. E-ISSN 2470-0029
Research Infrastructure: CERN-CZ II - 90104; e-INFRA CZ - 90140
Institutional support: RVO:68378271
Keywords : p p: scattering * p p: colliding beams * Higgs particle: rare decay
OECD category: Particles and field physics
Impact factor: 5, year: 2022
Method of publishing: Open access

This paper presents a search for decays of the Higgs boson with a mass of 125 GeV into a pair of new pseudoscalar particles, H→aa, where one a-boson decays into a b-quark pair and the other into a muon pair. The search uses 139  fb-1 of proton-proton collision data at a center-of-mass energy of s=13  TeV recorded between 2015 and 2018 by the ATLAS experiment at the LHC. A narrow dimuon resonance is searched for in the invariant mass spectrum between 16 GeV and 62 GeV. The largest excess of events above the Standard Model backgrounds is observed at a dimuon invariant mass of 52 GeV and corresponds to a local (global) significance of 3.3σ (1.7σ). Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to the bbμμ final state, B(H→aa→bbμμ), and are in the range 0.2–4.0×10-4, depending on the signal mass hypothesis.
Permanent Link: https://hdl.handle.net/11104/0337250