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

ATLAS Publications, J.F. Allen, T.M. Carter, D. Duda, J.M. Gargan, R.Y. Gonzalez Andana, A. Hasib, V.A. Parrish, E.A. Pender, T. Qiu, E.P. Takeva, N. Themistokleous, E.M. Villhauer, Z. Xu, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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 √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)1-22
Number of pages22
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 13 Oct 2023

Keywords / Materials (for Non-textual outputs)

  • Double-Parton Scatterings
  • J/PSI-Pair Production


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