Observation of an Excess of Dicharmonium Events in the Four-Muon Final State with the ATLAS Detector
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Dosyalar
Tarih
2023-10-11
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Physical Society
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
A search is made for potential ccc? c? tetraquarks decaying into a pair of charmonium states in the four ffiffi muon final state using proton-proton collision data at ps ¼ 13 TeV, corresponding to an integrated luminosity of 140 fb?1 recorded by the ATLAS experiment at LHC. Two decay channels, J=? ? J=? ? 4? and J=? ? ? ?2S? ? 4?, 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=? 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=? ? ? ?2S? channel. The fitted masses and decay widths of the structures are reported. © 2023 CERN, for the ATLAS Collaboration.
Açıklama
Anahtar Kelimeler
Charged particles, Germanium alloys, Germanium compounds, Intelligent systems
Kaynak
Physical Review Letters
WoS Q Değeri
Q1
