On the description of exclusive processes beyond the leading twist approximation
High Energy Physics - Phenomenology
2009-12-22 v2
Abstract
We describe hard exclusive processes beyond the leading twist approximation in a framework based on the Taylor expansion of the amplitude around the dominant light-cone directions. This naturally introduces an appropriate set of non-perturbative correlators whose number is minimalized after taking into account QCD equations of motion and the invariance under rotation on the light-cone. We examplify this method at the twist 3 level and show that the coordinate and momentum space descriptions are fully equivalent.
Cite
@article{arxiv.0903.4797,
title = {On the description of exclusive processes beyond the leading twist approximation},
author = {I. V. Anikin and D. Yu. Ivanov and B. Pire and L. Szymanowski and S. Wallon},
journal= {arXiv preprint arXiv:0903.4797},
year = {2009}
}
Comments
6 pages, 2 figures, modified and slightly expanded version to be published in Phys.Lett. B