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A comprehensive analysis of the pion-photon transition form factor in the leading order approximation
黄涛(理); Huang, T; Wu, XG
2007
发表期刊INTERNATIONAL JOURNAL OF MODERN PHYSICS A
卷号22期号:18页码:3065-3086
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
文章类型Article
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.
关键词pion-photon form factor transverse momentum higher Fock states
学科领域Physics
研究领域[WOS]Physics ; Physics
DOI10.1142/S0217751X07036671
URL查看原文
语种英语
研究领域[WOS]Physics ; Physics
WOS类目Physics, Nuclear ; Physics, Particles & Fields
WOS记录号WOS:000251712800003
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被引频次:19[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/239863
专题理论物理室
作者单位中国科学院高能物理研究所
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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.
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