A unitary and causal effective field theory
High Energy Physics - Phenomenology
2015-05-20 v1
Abstract
We report on a novel scheme based on the chiral Lagrangian. It is used to analyze pion-nucleon scattering, pion photoproduction, and nucleon Compton scattering. Subthreshold partial-wave amplitudes are calculated in chiral perturbation theory and analytically extrapolated with constraints imposed by electromagnetic-gauge invariance, causality and unitarity. Experimental quantities are reproduced up to energies MeV in terms of the parameters relevant at order .
Cite
@article{arxiv.1010.5332,
title = {A unitary and causal effective field theory},
author = {A. M. Gasparyan and M. F. M. Lutz},
journal= {arXiv preprint arXiv:1010.5332},
year = {2015}
}
Comments
4 pages, contribution to the proceedings of the MENU 2010 conference, May 31-June 4, 2010, Williamsburg VA, USA