1998/10/31 by Yeong Gyun Kim, P. Ko, Jae Sik Lee
Physics and Astronomy · #hep-ph
published as Nucl.Phys. B544 (1999) 64-88 · 30 pages, 10 figures. Updated data on b -> s gamma are used, to appear Nucl. Phys. B
arxiv created 1999/01/21 · arxiv updated 2009/11/30
We consider possible new physics contributions to b→ s l+ l- assuming the new physics modifies (chromo)magnetic and electric form factors in b→ s γ^* and b→ s g with the same chirality structure as in the standard model. Parametrizing the new physics effects on b→ s γ^* and b→ s g in terms of four real parameters, one finds that there are enough region of parameter space in which the measured branching ratio for B → Xs γcan be accomodated, and the predicted CP violation effect could be as large as ∼ 30%. Moreover, the branching ratio and the forward-backward asymmetry of a lepton in B → Xs l+ l- and the tau polarization asymmetry in B → Xs τ+ τ- can be deviated from the SM predictions by a factor of ∼ 2, which can be accessible at B factories. We also discuss these observables in a specific class of supersymmetric models with gluino-mediated flavor changing neutral current (FCNC).