CP Violation in Hyperon Decays

Abstract

In this talk I review theoretical predictions for CP violation in non-leptonic hyperon decays in the Standard Model and models beyond. In the Standard Model the CP violating observable $A$ in the polarization asymmetries of $\Lambda \to p{\pi }^{-}$ and ${\Xi }^{-}\to \Lambda {\pi }^{-}$ decays are predicted to be in the ranges $(-0.61\sim 6.8)\times 10^{-5}$ and $-(0.1\sim 1)\times 10^{-5}$, respectively. These ranges are below the sensitivity of $1.4\times 10^{-4}$ for $A({\Lambda }_{-}^0)+A({\Xi }_{-}^0)$ for E871 experiment at Fermilab. When going beyond the SM, such as, Supersymmetric and Left-Right symmetric models, $A$ can be as large as $10^{-3}$ and a few times of $10^{-4}$, respectively. Studies of hyperon decays can provide important information about CP violation.

8 pages and 1 figure. Plenary talk presented at the Kaon2001, 12 -17, Pisa, Italy