Phenomenology of B→ππ, πK decays at O(αs2β0) in QCD factorization

被引：4

作者：

Burrell, Craig N.

Williamson, Alexander R.

机构：

[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[2] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA

来源：

PHYSICAL REVIEW D | 2006年 / 73卷 / 11期

关键词：

D O I：

10.1103/PhysRevD.73.114004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study O(alpha(2)(s)beta(0)) perturbative corrections to matrix elements entering two-body exclusive decays of the form B -> pi pi, pi K in the QCD factorization formalism, including chirally enhanced power corrections, and discuss the effect of these corrections on direct CP asymmetries, which receive their first contribution at O(alpha(s)). We find that the O(alpha(2)(s)beta(0)) corrections are often as large as the O(alpha(s)) corrections. We find large uncertainties due to renormalization scale dependence as well as poor knowledge of the nonperturbative parameters. We assess the effect of the perturbative corrections on the direct CP violation parameters of B-0 -> pi(+)pi(-).

引用

页数：14

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