%0 Journal Article
%T Sigma-term physics in the perturbative chiral quark model
%A V. E. Lyubovitskij
%A Th. Gutsche
%A Amand Faessler
%A E. G. Drukarev
%J Physics
%D 2000
%I arXiv
%R 10.1103/PhysRevD.63.054026
%X 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.
%U http://arxiv.org/abs/hep-ph/0009341v3