The reliability of pQCD approach in pion electromagnetic form factor
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/0207106,
title = {The reliability of pQCD approach in pion electromagnetic form factor},
author = {Zheng-Tao Wei and Mao-Zhi Yang},
journal= {arXiv preprint arXiv:hep-ph/0207106},
year = {2007}
}
Comments
12 pages, 5 figures, the preprint of hep-ph/0207127 is canceled and this work is under collaboration of us