Gauge invariance and k(T)-factorization of exclusive processes
文献类型：期刊论文
| 作者 | Feng, F.; Ma, J. P. ; Wang, Q.; Ma, JP , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
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| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 2009 |
| 卷号 | 674期号:3页码:176-181 |
| 关键词 | Perturbative Qcd Approach B-meson Decays |
| ISSN号 | 0370-2693 |
| 英文摘要 | 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. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000265471000007 |
| 公开日期 | 2012-08-02 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/5343]  |
| 专题 | 理论物理研究所_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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：理论物理研究所
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