Possible New Physics Signals in b -> s gamma and b -> s l^+ l^-

Details Possible New Physics Signals in b -> s gamma and b -> s l^+ l^- Possible New Physics Signals in b -> s gamma and b -> s l^+ l^-

1998-10-13

arxiv.org/abs/hep-ph/9810336v2

Nucl.Phys. B544 (1999) 64-88

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, 10 figures. Updated data on b -> s gamma are used, to appear Nucl. Phys. B

Scientific paper

We consider possible new physics contributions to b\to s l^+ l^- assuming the new physics modifies (chromo)magnetic and electric form factors in b\to s \gamma^* and b\to s g with the same chirality structure as in the standard model. Parametrizing the new physics effects on b\to s \gamma^* and b\to 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 \to X_s \gamma can be accomodated, and the predicted CP violation effect could be as large as \sim 30%. Moreover, the branching ratio and the forward-backward asymmetry of a lepton in B \to X_s l^+ l^- and the tau polarization asymmetry in B \to X_s \tau^+ \tau^- can be deviated from the SM predictions by a factor of \sim 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).

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