2025/09/19 by LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +2353 · 2 voices · 1 citation
#hep-ex
paper · pdf · doi:10.48550/arxiv.2509.16103
A study of the difference in the CP asymmetries between Λ0b → J / ψp π- and Λ0b → J / ψp K- decays, Δ\cal ACP, is performed using proton-proton collision data collected by the LHCb experiment in the years 2015--2018, corresponding to an integrated luminosity of 6 \rm fb-1. This quantity is measured to be Δ\cal ACP=(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 Δ\cal ACP = (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.