Effect of the Flavor Changing Neutral Current on Rare $B$ decays

Abstract

We study the effect of the FCNC on rare $B$ decays in the beyond standard model with vector like singlet quarks. It has been shown that $b\to s\gamma$ does not receive sizable contribution compared with that of the standard model while $b\to d\gamma$, $b\to s(d)l^{+}{l}^{-}$, can be changed from the predictions of the standard model.

Comments: 7 pages, Proceeding of 1994 International Workshop on B Physics in Nagoya (World Scientific, 1995) 314, LaTeX, no figures