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Study of the B-→Λ+cΛ[bar]-cK- decay

The decay B−→Λ+c¯Λ−cK− is studied in proton-proton collisions at a center-of-mass energy of √s=13 TeV using data corresponding to an integrated luminosity of 5 fb−1 collected by the LHCb experiment. In the Λ+cK− system, the Ξc(2930)0 state observed at the BABAR and Belle experiments is resolved into...

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Main Authors: Aaij, Roel (Author) , Archilli, Flavio (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Borsato, Martino (Author) , Caspary, Rowina (Author) , Frau, Giulia (Author) , Grabowski, Jascha (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Kopecná, Renata (Author) , Kubat, Jakub (Author) , Leverington, Blake (Author) , Li, Peilian (Author) , Marks, Jörg (Author) , Mikhasenko, Mikhail (Author) , Neubert, Sebastian (Author) , Padeken, Klaas Ole (Author) , Promberger, Laura (Author) , Sarpis, Mindaugas (Author) , Skuza, Raphael (Author) , Unverzagt, Daniel Joachim (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: 27 July 2023
In: Physical review
Year: 2023, Volume: 108, Issue: 1, Pages: 012020-1-012020-15
ISSN:2470-0029
DOI:10.1103/PhysRevD.108.012020
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevD.108.012020
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.108.012020
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Author Notes:R. Aaij et al. (LHCb Collaboration)
Description
Summary:The decay B−→Λ+c¯Λ−cK− is studied in proton-proton collisions at a center-of-mass energy of √s=13 TeV using data corresponding to an integrated luminosity of 5 fb−1 collected by the LHCb experiment. In the Λ+cK− system, the Ξc(2930)0 state observed at the BABAR and Belle experiments is resolved into two narrower states, Ξc(2923)0 and Ξc(2939)0, whose masses and widths are measured to be m(Ξc(2923)0)=2924.5±0.4±1.1 MeV, m(Ξc(2939)0)=2938.5±0.9±2.3 MeV, Γ(Ξc(2923)0)=4.8±0.9±1.5 MeV, Γ(Ξc(2939)0)=11.0±1.9±7.5 MeV, where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt Λ+cK− sample. Evidence of a new Ξc(2880)0 state is found with a local significance of 3.8σ, whose mass and width are measured to be 2881.8±3.1±8.5 MeV and 12.4±5.3±5.8 MeV, respectively. In addition, evidence of a new decay mode Ξc(2790)0→Λ+cK− is found with a significance of 3.7σ. The relative branching fraction of B−→Λ+c¯Λ−cK− with respect to the B−→D+D−K− decay is measured to be 2.36±0.11±0.22±0.25, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.13.05.2024
Item Description:Im Titel sind der Buchstabe c tief- sowie die Zeichen + und - hochgestellt
*(LHCb Collaboration): R. Aaij, F. Archilli, S. Bachmann, D. Berninghoff, M. Borsato, R. Caspary, G. Frau, J. P. Grabowski, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopenca, J. Kubat, B. Leverington, P. Li, J. Marks, M. Mikhasenko, S. Neubert, K.O. Padeken, L. Promberger, M. Sarpis, R. Skuza, D.J. Unverzagt, U. Uwer, R. Waldi, C. Wang, L. Witola, A. Zhelezov [und weitere 1050 Personen]
Gesehen am 13.05.2024
Physical Description:Online Resource
ISSN:2470-0029
DOI:10.1103/PhysRevD.108.012020

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