A search is made for potential ccc̄ c̄ 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=ψ þ J=ψ → 4μ and J=ψ þ ψ ð2SÞ → 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 þ ψ ð2SÞ channel. The fitted masses and decay widths of the structures are reported.

Aad, G., Abbott, B., Abbott, D.C., Abed Abud, A., Abeling, K., Abhayasinghe, D.K., et al. (2023). Observation of an Excess of Dicharmonium Events in the Four-Muon Final State with the ATLAS Detector. PHYSICAL REVIEW LETTERS, 131(15) [10.1103/PhysRevLett.131.151902].

Observation of an Excess of Dicharmonium Events in the Four-Muon Final State with the ATLAS Detector

Cerri A.;
2023-01-01

Abstract

A search is made for potential ccc̄ c̄ 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=ψ þ J=ψ → 4μ and J=ψ þ ψ ð2SÞ → 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 þ ψ ð2SÞ channel. The fitted masses and decay widths of the structures are reported.
2023
Aad, G., Abbott, B., Abbott, D.C., Abed Abud, A., Abeling, K., Abhayasinghe, D.K., et al. (2023). Observation of an Excess of Dicharmonium Events in the Four-Muon Final State with the ATLAS Detector. PHYSICAL REVIEW LETTERS, 131(15) [10.1103/PhysRevLett.131.151902].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1297082