Measurement of the Ω c 0 and Ξ c 0 baryon lifetimes using hadronic b-baryon decays
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13130_2025_Article_27237.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
September 18, 2025
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration., Aaij, R., Abdelmotteleb, A.S.W. et al. Measurement of the Ω c 0 and Ξ c 0 baryon lifetimes using hadronic b-baryon decays. J. High Energ. Phys. 2025, 157 (2025).
Version
Final published version
Abstract
The lifetimes of the Ω c 0 and Ξ c 0 baryons are measured using a pp collision dataset collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. The charm baryons are produced in the fully reconstructed decay chains Ω b − → Ω c 0 → p K − K − π + π − and Ξ b − → Ξ c 0 → p K − K − π + π − . The measurement uses topologically and kinematically similar B− → D0(→ K−K+π−π+)π− decays for normalisation. The measured lifetimes are τ Ω c 0 = 276.3 ± 19.4 stat ± 1.8 syst ± 0.7 τ D 0 fs , τ Ξ c 0 = 149.2 ± 2.5 stat ± 0.9 syst ± 0.4 τ D 0 fs , where the first uncertainty is statistical, the second systematic and the third due to the uncertainty of the D0 lifetime. These results are consistent with previous measurements performed by the LHCb experiment.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1007/JHEP09(2025)157
