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Observation of new excited B0s states

A structure is observed in the B+- K-+ mass spectrum in a sample of proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9 fb-1. The structure is interpreted as the result of overlapping excite...

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Main Authors: Aaij, Roel (Author) , Archilli, Flavio (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Borsato, Martino (Author) , Frau, Giulia (Author) , Gerick, David (Author) , Grabowski, Jascha (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Kopecná, Renata (Author) , Leverington, Blake (Author) , Li, Peilian (Author) , Malygina, Hanna (Author) , Marks, Jörg (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 12 July 2021
In: The European physical journal. C, Particles and fields
Year: 2021, Volume: 81, Issue: 7, Pages: 1-11
ISSN:1434-6052
DOI:10.1140/epjc/s10052-021-09305-3
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-021-09305-3
Verlag, lizenzpflichtig, Volltext: https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-021-09305-3
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Author Notes:LHCb Collaboration
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Summary:A structure is observed in the B+- K-+ mass spectrum in a sample of proton-proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9 fb-1. The structure is interpreted as the result of overlapping excited B0s states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to B+- K-+, are determined to be m1 = 6063.5 ± 1.2 (stat) ± 0.8 (syst)MeV, Γ1= 26± 4(stat) ± 4 (syst)MeV, m2 = 6114 ± 3 (stat) ± 5 (syst) MeV, Γ2 = 66 ± 18 (stat) ± 21 (syst) MeV. Alternative values assuming a decay through B*±K∓, with a missing photon from the B*± rightarrow B± gamma decay, which are shifted by approximately 45 MeV, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed B*0s2 state is determined to be 0.87 ± 0.15 (stat) ± 0.19 (syst).
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LHCb Collaboration: R. Aaij, F. Archilli, S. Bachmann, M. Bachmayer, D. Berninghoff, M. Borsato, G. Frau, D. Gerick, J.P. Grabowski, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Copecna, B. Leverington, P. Li, H. Malygina, J. Marks, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, A. Zhelezov [und viele weitere]
Gesehen am 15.11.2021
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-021-09305-3

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