1998/05/31 by Matthias Neubert, Neubert, Matthias
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9806206
13 pages, 3 figures; contribution to the Proceedings of the Third Workshop on Continuous Advances in QCD, Minneapolis, Minnesota, 16-19 April 1998
arxiv created 1998/05/31 · arxiv updated 2009/11/30
The observation of a sizable direct CP asymmetry in the inclusive decays B -> Xs 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 -> Xs 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.