Constraints on Light Bottom Squarks from Radiative B-Meson Decays

The presence of a light {tilde b} squark (m{sub {tilde b}} {approx} 4 GeV) and gluino (m{sub {tilde g}} {approx} 15 GeV) might explain the observed excess in b-quark production at the Tevatron. Though provocative, this model is not excluded by present data. The light supersymmetric particles can induce large flavor-changing effects in radiative decays of B mesons. We analyze the decays B {yields} X{sub s}{gamma} and B {yields} X{sub sg} in this scenario and derive restrictive bounds on the flavor-changing quark-squark-gluino couplings.