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Pion electromagnetic form factor in the k(T) factorization formulae
Wu XG(吴兴刚); 黄涛(理); Wu, XG; Huang, T
2006
发表期刊INTERNATIONAL JOURNAL OF MODERN PHYSICS A
卷号21期号:4页码:901-904
通讯作者Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
文章类型Article; Proceedings Paper
摘要Based on the light-cone (LC) framework and the k(T) factorization formalism, the transverse momentum effects and the different helicity components' contributions to the pion form factor F-pi(Q(2)) are recalculated. In particular, the contribution to the pion form factor from the higher helicity components (lambda(1) + lambda(2) = +/- 1), which come from the spin-space Wigner rotation, are analyzed in the soft and hard energy regions respectively. Our results show that the right power behavior of the hard contribution from the higher helicity components can only be obtained by fully keeping the kT dependence in the hard amplitude, and that the kT dependence in LC wavefunction affects the hard and soft contributions substantially. A model for the twist-3 wavefunction psi(p)(x, k (perpendicular to)) of the pion has been constructed based on the moment calculation by applying the QCD sum rules, whose distribution amplitude has a better end-point behavior than that of the asymptotic one. With this model wavefunction, the twist-3 contributions including both the usual helicity components (lambda(1) + lambda(2) = 0) and the higher helicity components (lambda(1) + lambda(2) = +/- 1) to the pion form factor have been studied within the modified pQCD approach. Our results show that the twist-3 contribution drops fast and it becomes less than the twist-2 contribution at Q(2) similar to 10GeV(2). The higher helicity components in the twist-3 wavefunction will give an extra suppression to the pion form factor. When all the power contributions, which include higher order in alpha(S), higher helicities, higher twists in DA and etc., have been taken into account, it is expected that the hard contributions will fit the present experimental data well at the energy region where pQCD is applicable.
关键词higher helicity components twist-3 k(T) dependence
学科领域Physics
DOI10.1142/S0217751X06032277
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语种英语
WOS研究方向Physics
WOS类目Physics, Nuclear ; Physics, Particles & Fields
WOS记录号WOS:000236392600049
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被引频次:11[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/311005/238703
专题理论物理室
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
Wu XG,Huang T,Wu, XG,et al. Pion electromagnetic form factor in the k(T) factorization formulae[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS A,2006,21(4):901-904.
APA 吴兴刚,黄涛,Wu, XG,&Huang, T.(2006).Pion electromagnetic form factor in the k(T) factorization formulae.INTERNATIONAL JOURNAL OF MODERN PHYSICS A,21(4),901-904.
MLA 吴兴刚,et al."Pion electromagnetic form factor in the k(T) factorization formulae".INTERNATIONAL JOURNAL OF MODERN PHYSICS A 21.4(2006):901-904.
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