2 00 4 Updated analysis of meson - nucleon sigma terms in the perturbative chiral quark model

We present an updated analysis of meson-baryon sigma terms in the per-turbative chiral quark model, which is based on effective chiral Lagrangian. The new feature concerns the inclusion of excited states in the quark prop-agator. Its influence on meson loops is shown to lead in particular for the pion-nucleon sigma term to an enhancement relevant for the current evaluation of this quantity. We also determine various flavor combinations of the scalar nucleon form factors and their respective low-momentum transfer limits.