Looking for the Unexpected: Direct CP Violation in B -> X_s gamma Decays

Details Looking for the Unexpected: Direct CP Violation in B -> X_s gamma Decays Looking for the Unexpected: Direct CP Violation in B -> X_s gamma Decays

1998-05-31

arxiv.org/abs/hep-ph/9806206v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 3 figures; contribution to the Proceedings of the Third Workshop on Continuous Advances in QCD, Minneapolis, Minneso

Scientific paper

The observation of a sizable direct CP asymmetry in the inclusive decays B -> X_s gamma would be a clean signal of New Physics. In the Standard Model, this asymmetry is below 1% in magnitude. In extensions of the Standard Model with new CP-violating couplings, large asymmetries are possible without conflicting with the experimental value of the B -> X_s gamma branching ratio. In particular, large asymmetries arise naturally in models with enhanced chromo-magnetic dipole transitions. 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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