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LHCb Collaboration(Aaij, R. et al), Fernandez Casani, A., Jaimes Elles, S. J., Jashal, B. K., Libralon, S., Lucio Martinez, M., et al. (2026). First evidence of violation in beauty baryon to charmonium decays. Sci. Bull., 71(3), 547–557.
Abstract: A study of the difference in the CP asymmetries between Lambda(0)(b) -> J/psi p pi(-) and Lambda(0)(b) -> J/psi pK(-)decays, Delta A(CP), 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 Delta A(CP) = (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 Delta A(CP) = (4.31 +/- 1.06 +/- 0.28)% is obtained, corresponding to a significance of 3.9 sigma 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.
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