Probing hyperon CP violation from charmed baryon decays

Abstract

CP violation (CPV) in the baryon sectors has not yet been established experimentally. In this work, we propose to search for the hyperon CPV through the Cabibbo-favored charm-baryon decaying processes involving a hyperon in the final states, such as $\hat{I}{›}_c^{+}\to \hat{I}{›}^0\ddot{I}{€}^{+},\hat{I}{›}^0\to p\ddot{I}{€}^{-}$. The CPV of the hyperon decays are purely revealed in these chain processes, since the CPV in the Cabibbo-favored charm decays are vanishing in the Standard Model (SM). The hyperons are polarized in the weak charm decays, so that we can measure the Lee-Yang asymmetric parameter $\hat{I}\pm$ by the angular distributions, and then can measure the $\hat{I}\pm$-induced CPV. It can be found that it is accessible for Belle II and LHCb to reach the SM prediction of the hyperon CPV in the near future.

6 pages, 1 figure. References and discussions are added