Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-07-08
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 5 figures, the preprint of hep-ph/0207127 is canceled and this work is under collaboration of us
Scientific paper
The pion electromagnetic form factor with leading and next-to-leading twist corrections are studied in the framework of pQCD approach. We find that, at small momentum transfer regions, Sudakov effects cannot provide a strong enough suppression of the non-perturbative contributions coming from large transverse separations, but at large momentum transfer region, non-perturbative contributions can be effectively suppressed. So pQCD approach can be applied at large momentum transfer region. At the energy region where experiment can access so far, i.e. Q < 4GeV, pQCD prediction can not be precise because there may be a quite large part of contributions coming from non-perturbative region. The calculation of power corrections may not be performed systematically in pQCD framework.
Wei Zheng-Tao
Yang Mao-Zhi
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