Charged Pion-Pair Production and Pion Polarizabilities to two Loops
High Energy Physics - Phenomenology
2011-07-19 v1
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.
Cite
@article{arxiv.hep-ph/9602429,
title = {Charged Pion-Pair Production and Pion Polarizabilities to two Loops},
author = {Urs Buergi},
journal= {arXiv preprint arXiv:hep-ph/9602429},
year = {2011}
}
Comments
35 pages, LaTeX, uses epsf.sty and cite.sty, 15 postscript pictures included