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First observation of the charmless baryonic decay B+ → ¯Λ⁢𝑝⁢¯𝑝⁢𝑝

A search for the charmless baryonic decay 𝐵+ →¯Λ⁢𝑝⁢¯𝑝⁢𝑝 is performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 5.4 fb−1. The branching fraction for this decay is measured for the first time relative to that of the topologically s...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Celani, Sara (Author) , Cocha Toapaxi, Carlos (Author) , Dittmann, Lucas (Author) , Esen, Sevda (Author) , Glaser, Fabian (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Herrero Gascón, Paula (Author) , Kolb, Ruben (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Roy, Shreya (Author) , Ruiz Diaz, Miguel (Author) , Schiller, Manuel (Author) , Tat, Martin Duy (Author) , Tuci, Giulia (Author) , Uecker, Lennart Henning (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Wolf, Tom (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 22 December, 2025
In: Physical review letters
Year: 2025, Volume: 135, Issue: 26, Pages: 1-14
ISSN:1079-7114
DOI:10.1103/3pcs-dxtn
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/3pcs-dxtn
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/3pcs-dxtn
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Author Notes:R. Aaij et al.* (LHCb Collaboration)
Description
Summary:A search for the charmless baryonic decay 𝐵+ →¯Λ⁢𝑝⁢¯𝑝⁢𝑝 is performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 5.4 fb−1. The branching fraction for this decay is measured for the first time relative to that of the topologically similar decay 𝐵+ →𝐽/𝜓⁢𝐾+, with 𝐽/𝜓 →¯Λ⁢𝑝⁢𝐾−. The branching fraction is measured to be ℬ⁡(𝐵+ →¯Λ⁢𝑝⁢¯𝑝⁢𝑝) =(2.15 ±0.35 ±0.12 ±0.28) ×10−7, where the first uncertainty is statistical, the second is systematic, and the third arises from the uncertainty in the normalization channel branching fraction. The 𝐶⁢𝑃 asymmetry is measured to be 𝒜𝐶⁢𝑃 =(5.4 ±15.6 ±2.4)%, where the uncertainties are statistical and systematic. The background-subtracted invariant-mass distributions of ¯Λ⁢𝑝 and ¯𝑝⁢𝑝 pairs exhibit pronounced enhancements at both kinematic thresholds, in contrast to a uniform phase-space distribution.
Item Description:Im Titel hat "lambda" einen Oberstrich und der zweite Buchstabe p hat einen Oberstrich, das Pluszeichen ist hochgestellt
The LHCb collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, S. Celani, C.E. Cocha Toapaxi, L. Dittmann, S. Esen, F. Glaser, P.A. Günther, X. Han, S. Hausmann-Menzemer, P. Herrero Gascon, R. Kolb, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, S.R. Roy, M. Ruiz Diaz, M. Schiller, M.D. Tat, G. Tuci, L.H. Uecker, D.J. Unverzagt, U. Uwer, C. Wang, T. Wolf, Y. Zhao, A. Zhelezov [und weitere 1178 Personen]
Gesehen am 27.08.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/3pcs-dxtn

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