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

Aad G.
•
Abbott B.
•
Abeling K.
altro
Zwalinski L.
2023
  • journal article

Periodico
PHYSICAL REVIEW LETTERS
Abstract
A search is made for potential ccc[over ̄]c[over ̄] tetraquarks decaying into a pair of charmonium states in the four muon final state using proton-proton collision data at sqrt[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.
DOI
10.1103/PhysRevLett.131.151902
Archivio
https://hdl.handle.net/11390/1267086
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85175279527
https://ricerca.unityfvg.it/handle/11390/1267086
Diritti
open access
google-scholar
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