Branching fractions, polarisation and asymmetries of B→V V decays

被引：225

作者：

Beneke, Martin

Rohrer, Johannes ^{[1
]}

Yang, Deshan

机构：

[1] Rhein Westfal TH Aachen, Inst Theoret Phys E, D-52056 Aachen, Germany

[2] Nagoya Univ, Theoret Particle Phys Grp Eken, Chikusa Ku, Nagoya, Aichi 4648602, Japan

来源：

NUCLEAR PHYSICS B | 2007年 / 774卷

基金：

日本学术振兴会;

关键词：

D O I：

10.1016/j.nuclphysb.2007.03.020

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We calculate the hard-scattering kernels relevant to the negative-helicity decay amplitude in B decays to two vector mesons in the framework of QCD factorisation. We then perform a comprehensive analysis of the 34 B -> V V decays, including B-s decays and the complete set of polarisation observables. We find considerable uncertainties from weak annihilation and the non-factorisation of spectator-scattering. Large longitudinal polarisation is expected with certainty only for a few tree-dominated colour-allowed modes, which receive small penguin and spectator-scattering contributions. This allows for an accurate determination of the CKM angle alpha (or gamma) from S-L(rho rho) resulting in alpha = (85.6(-7.3)(+7.4))degrees. We also emphasize that the rho K* system is ideal for an investigation of electroweak penguin effects. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：64 / 101

页数：38

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