Sigma-term physics in the perturbative chiral quark model

Details Sigma-term physics in the perturbative chiral quark model Sigma-term physics in the perturbative chiral quark model

2000-09-29

arxiv.org/abs/hep-ph/0009341v3

Phys.Rev. D63 (2001) 054026

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, LaTeX-file, 2 Figures

Scientific paper

10.1103/PhysRevD.63.054026

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.

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