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Observation of multiplicity dependent prompt χc1(3872) and ψ(2S) production in pp collisions

The production of χc1(3872) and ψ(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2 fb−1. For both states, the fraction that is produced promptly at the collision vertex is found...

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Hauptverfasser: Aaij, Roel (VerfasserIn) , Archilli, Flavio (VerfasserIn) , Bachmann, Sebastian (VerfasserIn) , Berninghoff, Daniel (VerfasserIn) , Borsato, Martino (VerfasserIn) , Dziewiecki, Michal (VerfasserIn) , Frau, Giulia (VerfasserIn) , Gerick, David (VerfasserIn) , Grabowski, Jascha (VerfasserIn) , Günther, Paul André (VerfasserIn) , Han, Xiaoxue (VerfasserIn) , Hansmann-Menzemer, Stephanie (VerfasserIn) , Hu, Jiangqiao (VerfasserIn) , Kopecná, Renata (VerfasserIn) , Leverington, Blake (VerfasserIn) , Li, Peilian (VerfasserIn) , Malygina, Hanna (VerfasserIn) , Marks, Jörg (VerfasserIn) , Meinert, Nis (VerfasserIn) , Piucci, Alessio (VerfasserIn) , Stemmle, Simon (VerfasserIn) , Unverzagt, Daniel Joachim (VerfasserIn) , Uwer, Ulrich (VerfasserIn) , Viemann, Harald (VerfasserIn) , Waldi, Roland (VerfasserIn) , Wang, Chishuai (VerfasserIn) , Witola, Lukas (VerfasserIn) , Zhelezov, Alexey (VerfasserIn)
Körperschaft: LHCb Collaboration (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 5 March 2021
In: Physical review letters
Year: 2021, Jahrgang: 126, Heft: 9, Pages: 1-11
ISSN:1079-7114
DOI:10.1103/PhysRevLett.126.092001
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.126.092001
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.126.092001
Volltext
Verfasserangaben:R. Aaij et al. (LHCb Collaboration)
Beschreibung
Zusammenfassung:The production of χc1(3872) and ψ(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2 fb−1. For both states, the fraction that is produced promptly at the collision vertex is found to decrease as charged particle multiplicity increases. The ratio of χc1(3872) to ψ(2S) cross sections for promptly produced particles is also found to decrease with multiplicity, while no significant dependence on multiplicity is observed for the equivalent ratio of particles produced away from the collision vertex in b-hadron decays. This behavior is consistent with a calculation that models the χc1(3872) structure as a compact tetraquark. Comparisons with model calculations and implications for the binding energy of the χc1(3872) state are discussed.
Beschreibung:Im Titel ist "c1" tiefgestellt
Gesehen am 13.04.2021
Beschreibung:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.126.092001

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