Supersymmetric $b\to s\gamma$ with Large Chargino Contributions

Abstract

Supersymmetric (SUSY) theories are often thought to give large branching ratios for $b\to s\gamma$ from charged Higgs loops. We show that in many cases chargino loop contributions can cancel those of the Higgs, and SUSY can give $B(b\to s\gamma )$ at or below the \SM\ prediction. We show this occurs because the large stop mass splittings usually found in SUSY break a GIM mechanism suppression. These effects are strongly enhanced by large $\tan \beta$, so that $B(b\to s\gamma )$ is very sensitive to the value of $\tan \beta$, contrary to what has been claimed. We also note that the supergravity relation $B_0=A_0-1$ is somewhat disfavored over the general case.

TRI-PP-93-66. 12pp (Plain LATEX)+4 fig not incl. PostScript file of figs available (~3MB), contact Corrie Kost [email protected]. Request hardcopy or FAX of figures through [email protected]

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