A study of the difference in the CP asymmetries between Λb0→J/ψpπ- and Λb0→J/ψpK- decays, ΔACP, 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 ΔACP=(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 ΔACP=(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.

First evidence of CP violation in beauty baryon to charmonium decays / R. Aaij, A.S.W.A.. - In: SCIENCE BULLETIN. - ISSN 2095-9273. - 71:3(2026 Feb), pp. 547-557. [10.1016/j.scib.2025.12.028]

First evidence of CP violation in beauty baryon to charmonium decays

S. Cesare;P. Gandini;C. Mancuso;D. Marangotto;A. Merli;N. Neri;G. Tonani;T. Tork;Z. Wang;
2026

Abstract

A study of the difference in the CP asymmetries between Λb0→J/ψpπ- and Λb0→J/ψpK- decays, ΔACP, 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 ΔACP=(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 ΔACP=(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.
B physics; CP violation; Flavour physics; LHCb experiment; Standard Model; Triple-product asymmetries;
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
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   246806
feb-2026
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1251235
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