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

Details Updated analysis of meson-nucleon sigma terms in the perturbative chiral quark model Updated analysis of meson-nucleon sigma terms in the perturbative chiral quark model

2003-11-21

arxiv.org/abs/hep-ph/0311275v2

Phys.Rev. C69 (2004) 035207

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 10 figures, to be published in Phys Rev C

Scientific paper

10.1103/PhysRevC.69.035207

We present an updated analysis of meson-baryon sigma terms in the perturbative chiral quark model, which is based on effective chiral Lagrangian. The new feature concerns the inclusion of excited states in the quark propagator. 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.

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