LIGHT STOP AND THE B-]S-GAMMA-PROCESS

A constraint from the b-->sgamma process to the minimal supersymmetric model is derived in the light stop region where the coupling between the lighter stop and the Z0 boson vanishes due to the left-right mixing of the stop states. It is pointed out that although some region in the parameter space is excluded from this process there remains a large parameter space where the amplitude of the b-->sgamma is suppressed due to partial cancellation between different diagrams. A stop as light as 20 GeV is still viable from the b-->sgamma constraint.