Chiral Dynamics of Baryons in a Lorentz Covariant Quark Model

Details Chiral Dynamics of Baryons in a Lorentz Covariant Quark Model Chiral Dynamics of Baryons in a Lorentz Covariant Quark Model

2005-11-29

arxiv.org/abs/hep-ph/0511319v3

Phys.Rev. D73 (2006) 114021

Physics

High Energy Physics

High Energy Physics - Phenomenology

42 pages, 12 figures, accepted for publication in Phys. Rev. D

Scientific paper

10.1016/j.ppnp.2005.01.026

We develop a manifestly Lorentz covariant chiral quark model for the study of baryons as bound states of constituent quarks dressed by a cloud of pseudoscalar mesons. The approach is based on a non-linear chirally symmetric Lagrangian, which involves effective degrees of freedom - constituent quarks and the chiral (pseudoscalar meson) fields. In a first step, this Lagrangian can be used to perform a dressing of the constituent quarks by a cloud of light pseudoscalar mesons and other heavy states using the calculational technique of infrared dimensional regularization of loop diagrams. We calculate the dressed transition operators with a proper chiral expansion which are relevant for the interaction of quarks with external fields in the presence of a virtual meson cloud. In a second step, these dressed operators are used to calculate baryon matrix elements. Applications are worked out for the masses of the baryon octet, the meson-nucleon sigma terms, the magnetic moments of the baryon octet, the nucleon charge radii, the strong vector meson-nucleon couplings and the full momentum dependence of the electromagnetic form factors of the nucleon.

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