Large CP violation in charmed baryon decays

Abstract

This work presents the first detailed numerical predictions of CP violation in antitriplet charmed baryon decays. Adopting the flavor $SU(3{)}_F$ symmetry and the final state re-scattering framework, we relate the CKM-suppressed amplitudes to the leading ones, which are proportional to ${\lambda }_b$ and ${\lambda }_d$, respectively, with ${\lambda }_q=V_{uq}{V}_{cq}^{\ast }$. Larger-than-expected CP violations are found, reaching the order of $10^{-3}$, similar in magnitude to those in $D^0\to {\pi }^{+}{\pi }^{-},K^{+}{K}^{-}$. This opens a promising avenue for observing CP violation in charmed baryon decays and testing the Standard Model.

Comments: 7 pages, 4 figures, accepted by Science Bulletin