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 $\hat{I}{»}_b$ and $\hat{I}{»}_d$, respectively, with $\hat{I}{»}_q=V_{uq}{V}_{cq}^{\ast }$. Larger-than-expected CP violations are found, reaching the order of $10^{-3}$, similar in magnitude to those in $D^0\to \ddot{I}{€}^{+}\ddot{I}{€}^{-},K^{+}{K}^{-}$. This opens a promising avenue for observing CP violation in charmed baryon decays and testing the Standard Model.

7 pages, 4 figures, accepted by Science Bulletin