A Quark Model Calculation of gamma gamma to pi pi Including Final State Interactions

Details A Quark Model Calculation of gamma gamma to pi pi Including Final State Interactions A Quark Model Calculation of gamma gamma to pi pi Including Final State Interactions

1999-08-30

arxiv.org/abs/hep-ph/9908509v2

Phys.Rev.C61:025203,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 Revtex pages, 5 postscript figures

Scientific paper

10.1103/PhysRevC.61.025203

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.

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