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Gauge invariance and k(T)-factorization of exclusive processes
Feng, F.; Ma, J. P.; Wang, Q.; Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
2009
发表期刊PHYSICS LETTERS B
ISSN0370-2693
卷号674期号:3页码:176-181
摘要In 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.
部门归属[Feng, F; Ma, JP] Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; [Wang, Q] Nanjing Normal Univ, Dept Phys, Nanjing 210097, Jiangsu, Peoples R China; [Wang, Q] Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210097, Jiangsu, Peoples R China
关键词Perturbative Qcd Approach B-meson Decays
学科领域Physics
资助者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] ; National Nature Science Foundation of PR China[10721063, 10575126, 10747140]
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收录类别SCI
资助者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] ; National Nature Science Foundation of PR China[10721063, 10575126, 10747140]
WOS记录号WOS:000265471000007
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被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5343
专题理论物理所1978-2010年知识产出
通讯作者Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
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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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