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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
Source PublicationPHYSICAL REVIEW D
Corresponding AuthorChinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
AbstractA 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.
Subject AreaAstronomy & Astrophysics; Physics
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000225440600034
ADS Bibcode2004PhRvD..70i3013H
ADS URLhttps://ui.adsabs.harvard.edu/abs/2004PhRvD..70i3013H
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2004PhRvD..70i3013H/citations
Citation statistics
Cited Times:49 [INSPIRE]
Cited Times:53 [ADS]
Document Type期刊论文
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
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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