Distribution amplitude for the photon-pion transition
High Energy Physics - Phenomenology
2009-03-31 v1
Abstract
The exclusive production of \pi\pi and \pi\rho in hard \gamma^{\star}\gamma scattering in the forward kinematical region where the virtual photon is highly off-shell are studied through the \gamma\to\pi^- Transition Distribution Amplitudes. The calculation is based on a covariant Bethe-Salpeter approach, applied to the Nambu - Jona-Lasinio model, for the determination of the pion bound state. In particular it is shown that the pion pole contribution produces a large enhancement of the differential cross section for the pion pair production with respect to previous estimates.
Cite
@article{arxiv.0812.3329,
title = {Distribution amplitude for the photon-pion transition},
author = {A. Courtoy and S. Noguera},
journal= {arXiv preprint arXiv:0812.3329},
year = {2009}
}
Comments
To appear in the proceedings of Light Cone 2008: Relativistic Nuclear and Particle Physics (LC2008), Mulhouse, France, 7-11 Jul 2008