Chiral Dynamics of Baryons in a Lorentz Covariant Quark Model
| Autor: | Valery E. Lyubovitskij, Th. Gutsche, K. Pumsa-ard, Amand Faessler |
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| Rok vydání: | 2005 |
| Předmět: |
Quark
Physics Nuclear and High Energy Physics Particle physics Meson High Energy Physics::Lattice Quark model Nuclear Theory High Energy Physics::Phenomenology FOS: Physical sciences Omega baryon Pseudoscalar meson Baryon Pseudoscalar High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) High Energy Physics::Experiment Nucleon Nuclear Experiment |
| DOI: | 10.48550/arxiv.hep-ph/0511319 |
| Popis: | 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. Comment: 42 pages, 12 figures, accepted for publication in Phys. Rev. D |
| Databáze: | OpenAIRE |
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