New bound on γ from B±→πK decays

被引：196

作者：

Neubert, M ^{[1
]}

Rosner, JL

机构：

[1] CERN, Div Theory, CH-1211 Geneva 23, Switzerland

[2] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[3] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

来源：

PHYSICS LETTERS B | 1998年 / 441卷 / 1-4期

基金：

美国能源部;

关键词：

D O I：

10.1016/S0370-2693(98)01194-0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A bound on the angle gamma of the unitarity triangle is derived using experimental information on the CP-averaged branching ratios for the rare decays B+/- --> pi (+/-) K-0 and B (+/-) --> pi(0)K (+/-). The theoretical description is cleaner than the Fleischer-Mannel analysis of the decays B (+/-) --> pi (+/-) K-0 and B-0 --> pi (-/+) K+/- in that the two decay rates differ only in a single isospin amplitude, which has a simple structure in the SU(3) Limit. As a consequence, electroweak penguin contributions and strong rescattering effects can be taken into account in a model-independent way. The resulting bound excludes values of cosy around approximate to 0.6 and is thus largely complementary to indirect constraints derived from a global analysis of the unitarity triangle. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：403 / 409

页数：7

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