Compton scattering from chiral dynamics with unitarity and causality
High Energy Physics - Phenomenology
2011-08-25 v2
Abstract
Proton Compton scattering is analyzed with the chiral Lagrangian. Partial-wave amplitudes are obtained by an analytic extrapolation of subthreshold reaction amplitudes computed in chiral perturbation theory, where the constraints set by electromagnetic-gauge invariance, causality and unitarity are used to stabilize the extrapolation. We present and discuss predictions for various spin observables and polarizabilties of the proton. While for the transition polarizabilities we recover the results of strict chiral perturbation theory, for the diagonal elements we find significant effects from rescattering.
Keywords
Cite
@article{arxiv.1102.3375,
title = {Compton scattering from chiral dynamics with unitarity and causality},
author = {A. M. Gasparyan and M. F. M. Lutz and B. Pasquini},
journal= {arXiv preprint arXiv:1102.3375},
year = {2011}
}
Comments
18 pages, 3 figures, revised version