Observation of the decay B s 0 → K 0 p p ¯ and measurement of the B s 0 → K 0 p p ¯ branching fractions
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13130_2025_Article_26697.pdf
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adefisoye, A. A.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Agapopoulou, C.
Date Issued
July 9, 2025
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration., Aaij, R., Abdelmotteleb, A.S.W. et al. Observation of the decay B0s → K0pp¯ and measurement of the B0(s) → K0pp¯ branching fractions. J. High Energ. Phys. 2025, 121 (2025).
Version
Final published version
Abstract
A study of the charmless baryonic decays B s 0 → K 0 p p ¯ is presented, where B s 0 denotes either a B0 or a B s 0 meson. The analysis is based on proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The decay B s 0 → K 0 p p ¯ is observed for the first time, with a measured branching fraction of (9.14 ± 1.69 ± 0.90 ± 0.33 ± 0.20) × 10−7 and a significance of 5.6σ. The uncertainties respectively account for statistical and systematic contributions, the precision of the branching fraction of the normalisation channel B0 → K0π+π− and the fragmentation fraction ratio fs/fd. The branching fraction determined for B 0 → K 0 p p ¯ is (2.82 ± 0.08 ± 0.12 ± 0.10) × 10−6, which is the most precise measurement to date.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP07(2025)121
