Direct CP Violation in B -> Xs gamma Decays as a Signature of New Physics
A. L. Kagan, M. Neubert
Abstract
We argue that the observation of a sizable direct CP asymmetry ACP in the inclusive decays B -> Xs gamma would be a clean signal of New Physics. In the Standard Model, ACP can be calculated reliably and is found to be below 1% in magnitude. In extensions of the Standard Model with new CP-violating couplings, large CP asymmetries are possible without conflicting with the experimental value of the branching ratio for the decays B -> Xs gamma. In particular, large asymmetries arise naturally in models with enhanced chromo-magnetic dipole operators. Some generic examples of such models are explored and their implications for the semileptonic branching ratio and charm yield in B decays discussed.
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