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Feng, Feng; Ma, Jian-Ping; Wang, Qi; Feng, F , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
Resummation of large logarithms in gamma*pi(0)->gamma
KeywordTransition Form-factors Pion Wave-function Transverse-momentum Exclusive Processes Qcd Meson Behavior
AbstractIn 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.
Subject AreaPhysics
Indexed BySCI
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorFeng, F , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Feng, Feng,Ma, Jian-Ping,Wang, Qi,et al. Resummation of large logarithms in gamma*pi(0)->gamma[J]. JOURNAL OF HIGH ENERGY PHYSICS,2007(6):-.
APA Feng, Feng,Ma, Jian-Ping,Wang, Qi,&Feng, F , Acad Sinica, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.(2007).Resummation of large logarithms in gamma*pi(0)->gamma.JOURNAL OF HIGH ENERGY PHYSICS(6),-.
MLA Feng, Feng,et al."Resummation of large logarithms in gamma*pi(0)->gamma".JOURNAL OF HIGH ENERGY PHYSICS .6(2007):-.
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