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Observation of an Excess of Dicharmonium Events in the Four-Muon Final State with the ATLAS Detector
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ATLAS Collaboration (Including: Becker, K., Guilloton, E., Harrison, P. F., Kerridge, B., Martin, T. A., Mitra, A., Pollard, C. S., Potamianos, K., Roberts, B. A. and Vladimirov, V.). (2023) Observation of an Excess of Dicharmonium Events in the Four-Muon Final State with the ATLAS Detector. Physical Review Letters, 131 (15). 151902. doi:10.1103/PhysRevLett.131.151902 ISSN 0031-9007.
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Official URL: https://doi.org/10.1103/PhysRevLett.131.151902
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.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Journal or Publication Title: | Physical Review Letters | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 0031-9007 | ||||||
| Official Date: | 13 October 2023 | ||||||
| Dates: |
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| Volume: | 131 | ||||||
| Number: | 15 | ||||||
| Article Number: | 151902 | ||||||
| DOI: | 10.1103/PhysRevLett.131.151902 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) |
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