0587963 - FZÚ 2025 RIV NL eng J - Journal Article
Aad, G. - Abbott, B. - Abeling, K. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2931 authors
Search for the decay of the Higgs boson to a Z boson and a light pseudoscalar particle decaying to two photons.
Physics Letters. B. Roč. 850, Mar (2024), č. článku 138536. ISSN 0370-2693. E-ISSN 1873-2445
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271
Keywords : branching ratio: upper limit * category * photon: pair production
OECD category: Particles and field physics
Impact factor: 4.3, year: 2023 ; AIS: 1.232, rok: 2023
Method of publishing: Open access
DOI: https://doi.org/10.1016/j.physletb.2024.138536

A search for the decay of the Higgs boson to a ZZ boson and a light, pseudoscalar particle, aa, decaying respectively to two leptons and to two photons is reported. The search uses the full LHC Run 2 proton-proton collision data at s=13s ​=13 TeV, corresponding to 139 fb−1−1 collected by the ATLAS detector. This is one of the first searches for this specific decay mode of the Higgs boson, and it probes unexplored parameter space in models with axion-like particles (ALPs) and extended scalar sectors. The mass of the aa particle is assumed to be in the range 0.1-33 GeV. The data are analysed in two categories: a merged category where the photons from the aa decay are reconstructed in the ATLAS calorimeter as a single cluster, and a resolved category in which two separate photons are detected. The main background processes are from Standard Model ZZ boson production in association with photons or jets.
Permanent Link: https://hdl.handle.net/11104/0355035