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Observation of a 𝐽/𝜓⁢Λ resonance consistent with a strange pentaquark candidate in 𝐵−→𝐽/𝜓⁢Λ⁢p[bar] decays

An amplitude analysis of 𝐵−→𝐽/𝜓⁢Λ⁢‾𝑝 decays is performed using 4400 signal candidates selected on a data sample of 𝑝⁢𝑝 collisions recorded at center-of-mass energies of 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9  fb−1. A narrow resonance in the 𝐽/𝜓⁢Λ syst...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Borsato, Martino (Author) , Caspary, Rowina (Author) , Frau, Giulia (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Kopecná, Renata (Author) , Leverington, Blake (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: 17 July 2023
In: Physical review letters
Year: 2023, Volume: 131, Issue: 3, Pages: 1-11
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.031901
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.131.031901
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.131.031901
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Author Notes:R. Aaij et al. (LHCb Collaboration)*
Description
Summary:An amplitude analysis of 𝐵−→𝐽/𝜓⁢Λ⁢‾𝑝 decays is performed using 4400 signal candidates selected on a data sample of 𝑝⁢𝑝 collisions recorded at center-of-mass energies of 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9  fb−1. A narrow resonance in the 𝐽/𝜓⁢Λ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4  MeV and 7.0±1.2±1.3  MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Because of the small 𝑄-value of the reaction, the most precise single measurement of the 𝐵− mass to date, 5279.44±0.05±0.07  MeV, is obtained.
Item Description:*LHCb Collaboration: R. Aaij, S. Bachmann, D. Berninghoff, M. Borsato, R. Caspary, G. Frau, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopecna, B. Leverington, J. Marks, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, A. Zhelezov [und 1054 weitere Personen]
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Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.131.031901

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