Constraints on Light Bottom Squarks from Radiative B-Meson Decays
  The presence of a light b-squark (with mass about 4 GeV) and gluino (with mass about 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 analyse the decays B->X_s gamma and B->X_{sg} in this scenario and derive restrictive bounds on the flavor-changing quark-squark-gluino couplings. 
Thomas Becher (SLAC), Stephan Braig, Matthias Neubert (Cornell   University), Alexander L. Kagan (Fermilab)