Observation of an excess of dicharmonium events in the four-muon final state with the ATLAS detector

0579073 - FZÚ 2024 RIV US 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 2928 authors
Observation of an excess of dicharmonium events in the four-muon final state with the ATLAS detector.
Physical Review Letters. Roč. 131, č. 15 (2023), č. článku 151902. ISSN 0031-9007. E-ISSN 1079-7114
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271
Keywords : muon: pair production * numerical calculations: Monte Carlo * ATLAS
OECD category: Particles and field physics
Impact factor: 8.6, year: 2022
Method of publishing: Open access

A search is made for potential ccc¯c¯ tetraquarks decaying into a pair of charmonium states in the four muon final state using proton-proton collision data at s=13  TeV, corresponding to an integrated luminosity of 140  fb-1 recorded by the ATLAS experiment at LHC. Two decay channels, J/ψ+J/ψ→4μ and J/ψ+ψ(2S)→4μ, are studied. Backgrounds are estimated based on a hybrid approach involving Monte Carlo simulations and data-driven methods. Statistically significant excesses with respect to backgrounds dominated by the single parton scattering are seen in the di-J/ψ channel consistent with a narrow resonance at 6.9 GeV and a broader structure at lower mass. A statistically significant excess is also seen in the J/ψ+ψ(2S) channel. The fitted masses and decay widths of the structures are reported.
Permanent Link: https://hdl.handle.net/11104/0347972