Time-dependent CP Asymmetry in B->K* gamma as a (Quasi) Null Test of the Standard Model

Details Time-dependent CP Asymmetry in B->K* gamma as a (Quasi) Null Test of the Standard Model Time-dependent CP Asymmetry in B->K* gamma as a (Quasi) Null Test of the Standard Model

2006-09-05

arxiv.org/abs/hep-ph/0609037v3

Phys.Lett.B642:478-486,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 1 figure, discussions on further power corrections added

Scientific paper

10.1016/j.physletb.2006.10.013

We calculate the dominant Standard Model contributions to the time-dependent CP asymmetry in B0->K*0 gamma, which is O(1/mb) in QCD factorisation. We find that, including all relevant hadronic effects, in particular from soft gluons, the asymmetry S is very small, S=-0.022\pm 0.015^{+0}_{-0.01}, and smaller than suggested recently from dimensional arguments in a 1/mb expansion. Our result implies that any significant deviation of the asymmetry from zero, and in particular a confirmation of the current experimental central value, S_{HFAG}=-0.28\pm 0.26, would constitute a clean signal for new physics.

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