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Observation of structure in the J/[psi]-pair mass spectrum

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Using proton-proton collision data at centre-of-mass energies of s=7,8 and 13TeV recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9fb-1, the invariant mass spectrum of J/ψ pairs is studied. A narrow structure around 6.9GeV/c2 matching the lin...

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Main Authors: Aaij, Roel (Author) , Archilli, Flavio (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Borsato, Martino (Author) , Dziewiecki, Michal (Author) , Frau, Giulia (Author) , Gerick, David (Author) , Grabowski, Jascha (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Kecke, Matthieu (Author) , Kopecná, Renata (Author) , Leverington, Blake (Author) , Li, Peilian (Author) , Malygina, Hanna (Author) , Marks, Jörg (Author) , Meinert, Nis (Author) , Neubert, Sebastian (Author) , Piucci, Alessio (Author) , Schmelling, Michael (Author) , Sarpis, Mindaugas (Author) , Skidmore, Nicola (Author) , Stemmle, Simon (Author) , Unverzagt, Daniel Joachim (Author) , Viemann, Harald (Author) , Uwer, Ulrich (Author) , Waldi, Roland (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 29 August 2020
In: Science bulletin
Year: 2020, Volume: 65, Issue: 23, Pages: 1983-1993
ISSN:2095-9281
DOI:10.1016/j.scib.2020.08.032
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.scib.2020.08.032
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S2095927320305685
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Author Notes:LHCb collaboration: Roel Aaij, Flavio Archilli, Sebastian Bachmann, Daniel Berninghoff, Martino Borsato, MichalDziewiecki, Giulia Frau, David Gerick, Jascha Grabowski, Paul André Günther, Xiaoxue Han, Stephanie Hansmann-Menzemer, Jiangqiao Hu, Matthieu Kecke, Renata Kopecná, Blake Leverington, Peilian Li, Hanna Malygina, Jörg Marks, Nis Meinert, Sebastian Neubert, Alessio Piucci, Michael Schmelling, Mindaugas Sarpis, Nicola Skidmore, Simon Stemmle, Daniel Joachim Unverzagt, Harald Viemann, Ulrich Uwer, Roland Waldi, Chishuai Wang, Lukas Witola, Alexey Zhelezov und weitere 939
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Summary:Using proton-proton collision data at centre-of-mass energies of s=7,8 and 13TeV recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9fb-1, the invariant mass spectrum of J/ψ pairs is studied. A narrow structure around 6.9GeV/c2 matching the lineshape of a resonance and a broad structure just above twice the J/ψ mass are observed. The deviation of the data from nonresonant J/ψ-pair production is above five standard deviations in the mass region between 6.2 and 7.4GeV/c2, covering predicted masses of states composed of four charm quarks. The mass and natural width of the narrow X(6900) structure are measured assuming a Breit-Wigner lineshape.
Item Description:Im Titel ist "psi" als griechischer Buchstabe dargestellt
Gesehen am 09.02.2021
Physical Description:Online Resource
ISSN:2095-9281
DOI:10.1016/j.scib.2020.08.032

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