Constraints on light bottom squarks from radiative B-meson decays

The presence of a light b̃ squark (mb̃∼4 GeV) and gluino (mg̃∼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→Xsγ and B→Xsg in this scenario and derive restrictive bounds on the flavor-changing quark–squark–gluino couplings.