ATLAS Collaboration;
(2023)
Observation of an Excess of Dicharmonium Events in the Four-Muon Final State with the ATLAS Detector.
Physical Review Letters
, 131
(15)
, Article 151902. 10.1103/PhysRevLett.131.151902.
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Abstract
A search is made for potential c c ¯ 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 → 4 μ and J / ψ + ψ ( 2 S ) → 4 μ , 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 ( 2 S ) channel. The fitted masses and decay widths of the structures are reported.
| Type: | Article |
|---|---|
| Title: | Observation of an Excess of Dicharmonium Events in the Four-Muon Final State with the ATLAS Detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.131.151902 |
| Publisher version: | https://doi.org/10.1103/PhysRevLett.131.151902 |
| Language: | English |
| Additional information: | Copyright © 2023 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10179871 |
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