Charged Pion-Pair Production and Pion Polarizabilities to two Loops

Details Charged Pion-Pair Production and Pion Polarizabilities to two Loops Charged Pion-Pair Production and Pion Polarizabilities to two Loops

1996-02-29

arxiv.org/abs/hep-ph/9602429v1

Nucl.Phys.B479:392-426,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

35 pages, LaTeX, uses epsf.sty and cite.sty, 15 postscript pictures included

Scientific paper

10.1016/0550-3213(96)00454-3

We evaluate the amplitude for gamma gamma --> pi^+ pi^- to two loops in the framework of chiral perturbation theory.The three new coupling constants that enter the result at this order in the low-energy expansion are estimated via resonance saturation. We discuss in addition the crossed channel processes gamma pi^+ --> gamma pi^+ - in particular the charged pion polarizabilities - to the same accuracy. The predictions are compared with available experimental information.

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