A Quark Model Calculation of gamma gamma to pi pi Including Final State Interactions
High Energy Physics - Phenomenology
2008-11-26 v2 Nuclear Theory
Abstract
A quark model calculation of the processes gamma gamma -> pi+ pi- and gamma gamma -> pi0 pi0 is performed. At tree level, only charged pions couple to the initial state photons and neutral pions are not expected in the final state. However, a small but significant gamma gamma -> pi0 pi0 cross section is observed. We demonstrate that this may be accounted for by a rotation in isospin space induced by final state interactions. The resulting pi+ pi- cross section is in good agreement with experiment while the pi0 pi0 cross section is in qualitative agreement with the data.
Cite
@article{arxiv.hep-ph/9908509,
title = {A Quark Model Calculation of gamma gamma to pi pi Including Final State Interactions},
author = {H. G. Blundell and S. Godfrey and G. Hay and E. S. Swanson},
journal= {arXiv preprint arXiv:hep-ph/9908509},
year = {2008}
}
Comments
22 Revtex pages, 5 postscript figures