Charged Pion-Pair Production and Pion Polarizabilities to two Loops

Abstract

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.

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

References in corpus (6)

• Chiral perturbation theory
• Chiral Perturbation Theory
• Extension of the Chiral Perturbation Theory Meson Lagrangian to Order $P^6$
• $K_{l4}$ - Decays Beyond One Loop
• Charged Pion Polarizabilities to two Loops
• Non-perturbative methods

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