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Scientific article
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English

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

ContributorsATLAS Collaboration
Published inPhysical review letters, vol. 131, no. 15, 151902
Publication date2023
First online date2023-10-13
Abstract

A search is made for potential ccc¯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.

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Keywords
  • P p: colliding beams
  • Resonance: production
  • Mass: width
  • (4muon): final state
  • P p: scattering
  • J/psi(3100): pair production
  • J/psi(3100): leptonic decay
  • Muon: pair production
  • Numerical calculations: Monte Carlo
  • ATLAS
  • Structure
  • Psi(3685): leptonic decay
  • Charmonium: pair production
  • Hybrid
  • Tetraquark
  • CERN LHC Coll
  • Narrow resonance
  • Resonance: mass: measured
  • Resonance: width
  • Width: measured
  • Background
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Observation of an Excess of Dicharmonium Events in the Four-Muon Final State with the ATLAS Detector. In: Physical review letters, 2023, vol. 131, n° 15, p. 151902. doi: 10.1103/physrevlett.131.151902
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Article (Published version)
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ISSN of the journal0031-9007
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