The perturbative limit of the two-pion distribution amplitude
High Energy Physics - Phenomenology
2009-10-31 v1
Abstract
We consider pion pair production in two-photon collisions, gamma* gamma -> pi+ pi-, at large photon virtuality Q^2 and center-of-mass energy \sqrt{s} in the hard-scattering picture. In the limit where s is large but s << Q^2 we derive an expression for the two-pion light-cone distribution in terms of the conventional pion distribution amplitudes. Our result reproduces the well-known scaling behavior, helicity selection rule and symmetry relations in this regime.
Cite
@article{arxiv.hep-ph/9912364,
title = {The perturbative limit of the two-pion distribution amplitude},
author = {M. Diehl and Th. Feldmann and P. Kroll and C. Vogt},
journal= {arXiv preprint arXiv:hep-ph/9912364},
year = {2009}
}
Comments
14 pages, 4 figures