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Observation of an excess of dicharmonium events in the four-muon final state with the ATLAS detector

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 βˆšπ‘  =13 TeV,correspondingto n integrated luminosity of 140 fbβˆ’1 recorded by the ATLAS experiment at LHC. Two decay channels, 𝐽/πœ“+𝐽/πœ“β†’4β’πœ‡ an...

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Main Authors: Aad, Georges (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Czurylo, Marta (Author) , Rio, Fernando del (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Klassen, Martin (Author) , Mkrtchyan, Tigran (Author) , Ott, Philipp (Author) , Rassloff, Damir Fabrice (Author) , Rodriguez Bosca, Sergi (Author) , Sauer, Christof (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Vigani, Luigi (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 13 October 2023
In: Physical review letters
Year: 2023, Volume: 131, Issue: 15, Pages: 1-22
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.151902
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.131.151902
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.131.151902
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Author Notes:G. Aad et al. (ATLAS Collaboration)
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Summary: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 βˆšπ‘  =13 TeV,correspondingto n integrated luminosity of 140 fbβˆ’1 recorded by the ATLAS experiment at LHC. Two decay channels, 𝐽/πœ“+𝐽/πœ“β†’4β’πœ‡ and 𝐽/πœ“+πœ“β‘(2⁒𝑆)β†’4β’πœ‡, 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/πœ“ 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/πœ“+πœ“β‘(2⁒S) channel. The fitted masses and decay widths of the structures are reported.
Item Description:ATLAS Corporation: G. Aad, L.M. Baltes, F. Bartels, M.M. Czurylo, F. Del Rio, S.J. Dittmeier, M. Dunford, S. Franchino, M. Klassen, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, S. Rodriguez Bosca, C. Sauer, A. Schoening, H-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser [und viele weitere]
Gesehen am 27.02.2025
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.151902

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