Long-Distance Dominance of the CP Asymmetry in B->X_{s,d}+gamma Decays

Details Long-Distance Dominance of the CP Asymmetry in B->X_{s,d}+gamma Decays Long-Distance Dominance of the CP Asymmetry in B->X_{s,d}+gamma Decays

2010-12-14

arxiv.org/abs/1012.3167v2

Phys.Rev.Lett.106:141801,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages

Scientific paper

10.1103/PhysRevLett.106.141801

We show that in the Standard Model the parametrically leading (by a factor 1/alpha_s) contribution to the inclusive CP asymmetry in B->X_{s,d}+gamma decays arises from a long-distance effect in the interference of the electromagnetic dipole amplitude with the amplitude for an up-quark penguin transition accompanied by soft gluon emission. This contribution is governed by a single hadronic parameter Lambda_{17}^u related to a matrix elements of a non-local operator. In view of current experimental data, a future precision measurement of the flavor-averaged CP asymmetry in B->X_s+gamma will signal the presence of new physics only if a value below -2% is found. A cleaner probe of new physics is offered by the difference of the CP asymmetries in charged versus neutral B-meson decays.

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