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

ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

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.

Original languageEnglish
Article number151902
Pages (from-to)151902
Number of pages1
JournalPhysical Review Letters
Volume131
Issue number15
DOIs
Publication statusPublished - 13 Oct 2023

ASJC Scopus subject areas

  • General Physics and Astronomy

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