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Feng, F.; Ma, J. P.; Wang, Q.; Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
Gauge invariance and k(T)-factorization of exclusive processes
Source PublicationPHYSICS LETTERS B
KeywordPerturbative Qcd Approach B-meson Decays
AbstractIn the k(T)-factorization for exclusive processes, the nontrivial k(T)-dependence of perturbative coefficients, or hard parts, is obtained by taking off-shell partons. This brings up the question of whether the k(T)-factorization is gauge invariant. We study the k(T)-factorization for the case pi gamma* -> 4 gamma at one-loop in a general covariant gauge. Our results show that the hard part contains a light-cone singularity that is absent in the Feynman gauge, which indicates that the k(T)-factorization is not gauge invariant. These divergent contributions come from the k(T)-dependent wave function of pi and are not related to a special process. Because of this fact the k(T)-factorization for any process is not gauge invariant and is violated. Our study also indicates that the k(T)-factorization used widely for exclusive B-decays is not gauge invariant and is violated. (C) 2009 Elsevier B.V. All rights reserved.
2009
ISSN0370-2693
Volume674Issue:3Pages:176-181
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational Nature Science Foundation of PR China[10721063, 10575126, 10747140] ; National Nature Science Foundation of PR China[10721063, 10575126, 10747140] ; National Nature Science Foundation of PR China[10721063, 10575126, 10747140] ; National Nature Science Foundation of PR China[10721063, 10575126, 10747140]
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Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5343
Collection理论物理所科研产出_SCI论文
Corresponding AuthorMa, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Feng, F.,Ma, J. P.,Wang, Q.,et al. Gauge invariance and k(T)-factorization of exclusive processes[J]. PHYSICS LETTERS B,2009,674(3):176-181.
APA Feng, F.,Ma, J. P.,Wang, Q.,&Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.(2009).Gauge invariance and k(T)-factorization of exclusive processes.PHYSICS LETTERS B,674(3),176-181.
MLA Feng, F.,et al."Gauge invariance and k(T)-factorization of exclusive processes".PHYSICS LETTERS B 674.3(2009):176-181.
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