Flavor Changing Decays of ${\rm Y}$ and $J/\psi$

Abstract

We study flavor changing processes ${\rm Y}\to B/\bar{B}{X}_s$ and $J/\psi \to D/\bar{D}{X}_u$ in the B factories and the Tau-Charm factories. In the standard model, these processes are predicted to be unobservable, so they serve as a probe of the new physics. We first perform a model independent analysis, then examine the predictions of models; such as top color models and MSSM with R-parity violation ; for the branching ratios of ${\rm Y}\to B/\bar{B}{X}_s$ and $J/\psi \to D/\bar{D}{X}_u$ . We find that these branching ratios could be as large as $10^{-6}$ and $10^{-5}$ in the presence of new physics.

Comments: Revtex, 6 pages, no figures. Presented at American Physical Society (APS) Meeting of the Division of Particles and Fields (DPF 99), Los Angeles, CA, 5-9 Jan 1999