A search is made for potential cc¯ c ¯ c tetraquarks decaying into a pair of charmonium states in the four muon final state using proton-proton collision data at ffiffiffi s p ¼13TeV, 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 þψð2SÞ → 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 GeVand a broader structure at lower mass. A statistically significant excess is also seen in the J=ψ þψð2SÞ channel. The fitted masses and decay widths of the structures are reported.

Aad, G., Abbott, B., Abeling, K., Abicht, N., Abidi, S., Aboulhorma, A., 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), 151902-1-151902-22 [10.1103/PhysRevLett.131.151902].

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

Alfonsi, F.;Bindi, M.;Boscherini, D.;Cabras, G.;Carratta, G.;Cavalli, N.;De Castro, S.;Fabbri, F.;Fabbri, L.;Franchini, M.;Gabrielli, A.;Lasagni Manghi, F.;Massa, L.;Monzani, S.;Polini, A.;Rinaldi, L.;Romano, M.;Sbarra, C.;Sbrizzi, A.;Semprini-Cesari, N.;Sioli, M.;Todome, K.;Valentinetti, S.;Villa, M.;Vittori, C.;Vivarelli, I.;Zoccoli, A.;
2023

Abstract

A search is made for potential cc¯ c ¯ c tetraquarks decaying into a pair of charmonium states in the four muon final state using proton-proton collision data at ffiffiffi s p ¼13TeV, 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 þψð2SÞ → 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 GeVand a broader structure at lower mass. A statistically significant excess is also seen in the J=ψ þψð2SÞ channel. The fitted masses and decay widths of the structures are reported.
2023
Aad, G., Abbott, B., Abeling, K., Abicht, N., Abidi, S., Aboulhorma, A., 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), 151902-1-151902-22 [10.1103/PhysRevLett.131.151902].
Aad, G.; Abbott, B.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Abusleme Hoffman, A. C.; Achar...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/953873
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