B-]S-GAMMA DECAY AND RIGHT-HANDED TOP-BOTTOM CHARGED CURRENT

We introduce an anomalous top quark coupling (right-handed current) in to the standard model Lagrangian. Based on this, a more complete calcu lation of b --> s gamma decay including leading log QCD corrections fr om mt to M(W) in addition to corrections from M(W) to m(b) is given. T he inclusive decay rate is found to be suppressed compared with the ca se without QCD running from mt to M(W) except at the time of small val ues of \f(R)(tb)\. For example, when f(R)(tb) = -0.08, it is only 1/10 of the value given before. As \f(R)(tb)\ gets smaller, this contribut ion is an enhancement as in the standard model case. From the new expe riment of the CLEO Collaboration, strict restrictions to parameters of this top-bottom quark coupling are found.