Model for the twist-3 wave function of the pion and its contribution to the pion form factor
黄涛(理); Wu XG(吴兴刚); Huang, T; Wu, XG
刊名PHYSICAL REVIEW D
2004
卷号70期号:9页码:93013
学科分类Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.70.093013
通讯作者Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
文章类型Article
英文摘要A model for the twist-3 wave function 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 wave function, 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 to10 GeV2. The higher helicity components in the twist-3 wave function will give an extra suppression to the pion form factor. The model dependence of the twist-3 contribution to the pion form factor has been studied by comparing four different models. 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.
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]Astronomy & Astrophysics ; Physics
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语种英语
WOS记录号WOS:000225440600034
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被引频次:42[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/311005/240851
专题中国科学院高能物理研究所_理论物理室_期刊论文
中国科学院高能物理研究所_理论物理室
作者单位中国科学院高能物理研究所
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Huang T,Wu XG,Huang, T,et al. Model for the twist-3 wave function of the pion and its contribution to the pion form factor[J]. PHYSICAL REVIEW D,2004,70(9):93013.
APA 黄涛,吴兴刚,Huang, T,&Wu, XG.(2004).Model for the twist-3 wave function of the pion and its contribution to the pion form factor.PHYSICAL REVIEW D,70(9),93013.
MLA 黄涛,et al."Model for the twist-3 wave function of the pion and its contribution to the pion form factor".PHYSICAL REVIEW D 70.9(2004):93013.
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