Nonperturbative effects in inclusive $B\to X_s\gamma$

Abstract

Uncertainties in the theoretical prediction for the inclusive $\bar{B}\to X_s\gamma$ decay rate are examined. Certain nonperturbative effects involving a virtual $c\bar{c}$ loop, which are calculable using the operator product expansion, are discussed.

Comments: Talk given at the FCNC'97 workshop, February 19-21, 1997, Santa Monica