Observation of an Excess of Dicharmonium Events in the Four-Muon Final State with the ATLAS Detector
Collaboration
22 pages
Published in:
- Phys.Rev.Lett. 131 (2023) 15, 151902
- Published: Oct 13, 2023
e-Print:
- 2304.08962 [hep-ex]
DOI:
- 10.1103/PhysRevLett.131.151902 (publication)
Report number:
- CERN-EP-2023-035
Experiments:
Citations per year
Abstract: (APS)
A search is made for potential tetraquarks decaying into a pair of charmonium states in the four muon final state using proton-proton collision data at , corresponding to an integrated luminosity of recorded by the ATLAS experiment at LHC. Two decay channels, and , 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- 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 channel. The fitted masses and decay widths of the structures are reported.Note:
- 32 pages in total, author list starting page 15, 5 figures, 3 tables, published in Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2022-01/
- 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
References(46)
Figures(15)
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