Sigma-term physics in the perturbative chiral quark model
High Energy Physics - Phenomenology
2009-10-31 v3
Abstract
We apply the perturbative chiral quark model (PCQM) at one loop to analyse meson-baryon sigma-terms. Analytic expressions for these quantities are obtained in terms of fundamental parameters of low-energy pion-nucleon physics (weak pion decay constant, axial nucleon coupling, strong pion-nucleon form factor) and of only one model parameter (radius of the nucleonic three-quark core). Our result for the piN sigma term of about 45 MeV is in good agreement with the value deduced by Gasser, Leutwyler and Sainio using dispersion-relation techniques and exploiting the chiral symmetry constraints.
Cite
@article{arxiv.hep-ph/0009341,
title = {Sigma-term physics in the perturbative chiral quark model},
author = {V. E. Lyubovitskij and Th. Gutsche and Amand Faessler and E. G. Drukarev},
journal= {arXiv preprint arXiv:hep-ph/0009341},
year = {2009}
}
Comments
19 pages, LaTeX-file, 2 Figures