Looking for the Unexpected: Direct CP Violation in B -> X_s gamma Decays
Abstract
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.
Cite
@article{arxiv.hep-ph/9806206,
title = {Looking for the Unexpected: Direct CP Violation in B -> X_s gamma Decays},
author = {Matthias Neubert},
journal= {arXiv preprint arXiv:hep-ph/9806206},
year = {2007}
}
Comments
13 pages, 3 figures; contribution to the Proceedings of the Third Workshop on Continuous Advances in QCD, Minneapolis, Minnesota, 16-19 April 1998