The anomalous process gamma pi -> pi pi to two loops

Details The anomalous process gamma pi -> pi pi to two loops The anomalous process gamma pi -> pi pi to two loops

2001-02-16

arxiv.org/abs/hep-ph/0102213v1

Nucl.Phys. B593 (2001) 577-595

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 4 figures

Scientific paper

10.1016/S0550-3213(00)00641-6

The amplitude for the anomalous process gamma pi -> pi pi is evaluated to two loops in the chiral expansion by means of a dispersive method. The two new coupling constants that enter at this order are estimated via sum rules derived from a non-perturbative chiral approach. With these coupling constants fixed, the numerical results are given and compared with the available experimental information.

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