A comprehensive analysis of the pion-photon transition form factor in the leading order approximation

	A comprehensive analysis of the pion-photon transition form factor in the leading order approximation
	黄涛(理); Huang, T; Wu, XG
刊名	INTERNATIONAL JOURNAL OF MODERN PHYSICS A
	2007
卷号	22 期号:18 页码:3065-3086
关键词	pion-photon form factor transverse momentum higher Fock states
通讯作者	[Huang, Tao] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China ; [Wu, Xing-Gang] Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
英文摘要	We perform a comprehensive analysis of the pion-photon transition form factor F-pi gamma(Q(2)) involving the transverse momentum corrections in the leading order approximation with the present CLEO experimental data, in which the contributions beyond the leading Fock state have been taken into consideration. As is well known, the leading Fock-state contribution dominates of F-pi gamma(Q(2)) at large momentum transfer (Q(2)) region. One should include the contributions beyond the leading Fock state in small Q(2) region. In this paper, we construct a phenomenological expression to estimate the contributions beyond the leading Fock state based on its asymptotic behavior at Q2 -> 0. Our present theoretical results agree well with the experimental data in the whole Q2 region. Then, we extract some useful information of the pionic leading twist-2 distribution amplitude (DA) by comparing our results of Fp(pi gamma)(Q(2)) with the CLEO data. By taking best fit, we have the distribution amplitude moments, a(2)(mu(2)(0)) = 0.002(-0.054)(+0.063), a(4)(mu(2)(0)) = -0.022(-0.012)(+0.026) and all of higher moments, which are closed to the asymptotic-like behavior of the pion wave function.
学科主题	Physics
类目[WOS]	Physics, Nuclear ; Physics, Particles & Fields
研究领域[WOS]	Physics
原文出处	SCI
语种	英语
WOS记录号	WOS:000251712800003
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/239863]
专题	高能物理研究所_理论物理室
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Huang T,Huang, T,Wu, XG. A comprehensive analysis of the pion-photon transition form factor in the leading order approximation[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS A,2007,22(18):3065-3086.
APA	黄涛,Huang, T,&Wu, XG.(2007).A comprehensive analysis of the pion-photon transition form factor in the leading order approximation.INTERNATIONAL JOURNAL OF MODERN PHYSICS A,22(18),3065-3086.
MLA	黄涛,et al."A comprehensive analysis of the pion-photon transition form factor in the leading order approximation".INTERNATIONAL JOURNAL OF MODERN PHYSICS A 22.18(2007):3065-3086.