First evidence of CP violation in beauty baryon to charmonium decayS



Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C
et al (show 1183 more authors) (2026) First evidence of CP violation in beauty baryon to charmonium decayS SCIENCE BULLETIN, 71 (3). pp. 547-557. ISSN 2095-9273, 2095-9281

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Abstract

A study of the difference in the CP asymmetries between Λ<inf>b</inf> 0→J/ψpπ- and Λ<inf>b</inf> 0→J/ψpK- decays, ΔA<inf>CP</inf>, is performed using proton-proton collision data collected by the LHCb experiment in the years 2015–2018, corresponding to an integrated luminosity of 6fb-1. This quantity is measured to be ΔA<inf>CP</inf>=(4.03±1.18±0.23)%, where the first uncertainty is statistical and the second is systematic. When combined with the previous LHCb result, a value of ΔA<inf>CP</inf>=(4.31±1.06±0.28)% is obtained, corresponding to a significance of 3.9σ against the CP symmetry hypothesis. Studies of triple-product asymmetries, which provide an additional probe of CP violation, show no significant deviation from CP symmetry.

Item Type: Article
Uncontrolled Keywords: Flavour physics, B physics, CP violation, Standard Model, LHCb experiment, Triple-product asymmetries
Divisions: Faculty of Science & Engineering
Faculty of Science & Engineering > School of Engineering
Faculty of Science & Engineering > School of Physical Sciences
Faculty of Science & Engineering > School of Physical Sciences > Physics
Faculty of Science & Engineering > School of Engineering > Civil and Environmental Engineering
Depositing User: Symplectic Admin
Date Deposited: 05 Jan 2026 09:46
Last Modified: 12 Jul 2026 06:54
DOI: 10.1016/j.scib.2025.12.028
Open Access URL: https://www.sciencedirect.com/science/article/pii/...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3196391
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