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Possible complex annihilation and B -> K pi direct CP asymmetry

Authors
Chay, JunegoneLi, Hsiang-nanMishima, Satoshi
Issue Date
8월-2008
Publisher
AMER PHYSICAL SOC
Keywords
CP asymmetry; annihilation
Citation
PHYSICAL REVIEW D, v.78, no.3
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW D
Volume
78
Number
3
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/122894
DOI
10.1103/PhysRevD.78.034037
ISSN
1550-7998
Abstract
We point out that a strong phase from the penguin annihilation channel in B meson decays is sensitive to the treatment of subleading terms with physical b quark mass m(b). In the limit of infinite heavy-quark mass, both the soft-collinear effective theory and the perturbative QCD approach based on the k(T) factorization theorem agree that the strong phase is suppressed. For finite heavy-quark mass, the two approaches predict different results, which are related to the treatment of subleading terms. This is illustrated by taking a toy model for soft-collinear effective theory, in which a small quantity, suppressed by O(Lambda/m(b)), with Lambda being a hadronic scale, is kept in the denominators of internal particle propagators. This model can generate a sizable strong phase to accommodate the data of the B-0 -> K--/+pi(+/-) direct CP asymmetry.
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