CP violation in $J/\psi \to \Lambda \bar{\Lambda }$

Abstract

We study CP violation in $J/\psi \to \Lambda \bar{\Lambda }$ decay. This decay provides a good place to look for CP violation. Some observables are very sensitive to the $\Lambda$ electric dipole moment $d_{\Lambda }$ and therefore can be used to improve the experimental upper bound on $d_{\Lambda }$. CP violations in the lepton pair decays of $J/\psi$ and ${\rm Y}$ are also discussed.

Comments: 8 pages, RevTex, UM-P-92/113, OZ-92/36