Power corrections in charmless nonleptonic B decays:: Annihilation is factorizable and real

被引：38

作者：

Arnesen, Christian M. ^{[1
]}

Ligeti, Zoltan ^{[1
,2
]}

Rothstein, Ira Z. ^{[3
]}

Stewart, Iain W. ^{[1
]}

机构：

[1] MIT, Ctr Theoret Phys, Nucl Sci Lab, Cambridge, MA 02139 USA

[2] Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

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

来源：

PHYSICAL REVIEW D | 2008年 / 77卷 / 05期

关键词：

D O I：

10.1103/PhysRevD.77.054006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We classify Lambda(QCD)/m(b) power corrections to nonleptonic B -> M1M2 decays, where M-1,M-2 are charmless nonisosinglet mesons. Using recent developments in soft- collinear effective theory, we prove that the leading contributions to annihilation amplitudes of order alpha(s) (m(b)) Lambda(QCD)/m(b) are real. The leading annihilation amplitudes depend on twist- 2 and twist- 3 three- parton distributions. A complex nonperturbative parameter from annihilation first appears at O[alpha(2)(s) (root Lambda m(b)) Lambda(QCD)/m(b)]. "Chirally enhanced'' contributions are also factorizable and real at lowest order. Thus, incalculable strong phases are suppressed in annihilation amplitudes, unless the alpha(s)(root Lambda m(b)) expansion breaks down. Modeling the distribution functions, we find that (11 +/- 9)% and (15 +/- 11)% of the absolute values of the measured (B) over bar (0) -> K- pi(+) and B- -> K- K-0 penguin amplitudes come from annihilation. This is consistent with the expected size of power corrections.

引用

页数：20

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