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题名: Resummation of large logarithms in gamma*pi(0)->gamma
作者: Feng, Feng ;  Ma, Jian-Ping ;  Wang, Qi
刊名: JOURNAL OF HIGH ENERGY PHYSICS
出版日期: 2007
期号: 6, 页码:-
关键词: TRANSITION FORM-FACTORS ;  PION WAVE-FUNCTION ;  TRANSVERSE-MOMENTUM ;  EXCLUSIVE PROCESSES ;  QCD ;  MESON ;  BEHAVIOR
学科分类: Physics
通讯作者: Feng, F , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
部门归属: Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; Nanjing Normal Univ, Dept Phys, Nanjing 210097, Jiangsu, Peoples R China; Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210097, Jiangsu, Peoples R China
英文摘要: In the collinear factorization of the form factor for the transition gamma*pi(0) -> gamma the hard part contains double log terms as In(2)x with x as the momentum fraction of partons from 0 to 1. A simple exponentiation for resummation leads to divergent results. We study the resummation of these In(2)x terms. We show that the In(2)x terms come partly from the light-cone wave function(LCWF) and partly from the form factor. We introduce a jet factor to factorize the In(2)x term in the form factor. To handel the In(2)x terms from the LCWF we introduce a nonstandard light-cone wave function(NLCWF) with the gauge links off the light-cone direction. An interesting relation between two wave function is found. With the introduced NLCWF and the jet factor we can re-factorize the form factor and obtain a new hard part which does not contain terms with In(2)x. Beside the renormalization scale p the introduced NLCWF and jet factor have extra scales to characterize their x-behaviors. Using the evolutions of the extra scales and the relation we can do the resummation perturbatively in sense that the LCWF is the only nonpertubative object in the resumed formula. Our results with some models of LCWF show that there is a significant difference between numerical predictions with the resummation and that without the resummation, and the resummed predictions can describe the experimental data.
收录类别: SCI
WOS记录号: WOS:000247900400048
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5727
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Feng, Feng,Ma, Jian-Ping,Wang, Qi. Resummation of large logarithms in gamma*pi(0)->gamma[J]. JOURNAL OF HIGH ENERGY PHYSICS,2007(6):-.
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