Direct CP Violation in B -> X_s gamma Decays as a Signature of New Physics

Details Direct CP Violation in B -> X_s gamma Decays as a Signature of New Physics Direct CP Violation in B -> X_s gamma Decays as a Signature of New Physics

1998-03-17

arxiv.org/abs/hep-ph/9803368v2

Phys.Rev. D58 (1998) 094012

Physics

High Energy Physics

High Energy Physics - Phenomenology

several references added and some numerical results updated to include QED corrections (version to appear in Physical Review D

Scientific paper

10.1103/PhysRevD.58.094012

We argue that the observation of a sizable direct CP asymmetry A_{CP} in the inclusive decays B -> X_s gamma would be a clean signal of New Physics. In the Standard Model, A_{CP} 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 -> X_s 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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