CP asymmetry in B0(t)→KSπ0γ in the standard model -: art. no. 014013

被引：38

作者：

Grinstein, B ^{[1
]}

Pirjol, D

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA

来源：

PHYSICAL REVIEW D | 2006年 / 73卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.73.014013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The time-dependent CP asymmetry in exclusive B-0(t) -> K-*0 gamma decays has been proposed as a probe of new physics in B decays. Recently, this method was extended to radiative decays into multibody hadronic final states such as B-0(t) -> K-S pi(0)gamma and B-0(t) -> pi(+)pi(-)gamma. The CP asymmetry in these decays vanishes to the extent that the photon is completely polarized. In the standard model, the photon emitted in b -> s gamma has high left-handed polarization, but right-handed contamination enters already at leading order in Lambda/m(b) even for vanishing light quark masses. We compute here the magnitude of this effect and the time-dependent CP asymmetry parameter S-KS pi(0)gamma. We find that the standard model can easily accommodate values of S as large as 10%, but a precise value cannot be obtained at present because of strong interactions uncertainties.

引用

页数：11

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