Chiral dynamics of baryons in a covariant quark model

Amand Faessler, Th Gutsche, V. E. Lyubovitskij, K. Pumsa-Ard

Research output: Contribution to journalReview article

6 Citations (Scopus)

Abstract

We developed a manifestly Lorentz covariant chiral quark model for the study of baryons as bound states of constituent quarks in an extension of our previous approach. The investigations are related to the ongoing and planned experiments on improved measurements of the elastic baryon form factors and their decay characteristics. The approach is based on a non-linear chirally symmetric Lagrangian, which involves effective degrees of freedom-constituent quarks and the chiral (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 developed by Becher and Leutwyler. 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. These operators are used in the calculation of baryon matrix elements.

Original languageEnglish
Pages (from-to)12-22
Number of pages11
JournalProgress in Particle and Nuclear Physics
Volume55
Issue number1
DOIs
Publication statusPublished - Jul 2005
Externally publishedYes
EventInternational School of Nuclear Physics 26th Course Lepton Scattering and the Structure of Hadrons and Nuclei -
Duration: 16 Sep 200424 Sep 2004

Fingerprint

chiral dynamics
quark models
baryons
quarks
mesons
operators
form factors
degrees of freedom
expansion
decay
matrices
interactions

Keywords

  • Baryons
  • Chiral symmetry
  • Nucleon form factors
  • Relativistic quark model

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Chiral dynamics of baryons in a covariant quark model. / Faessler, Amand; Gutsche, Th; Lyubovitskij, V. E.; Pumsa-Ard, K.

In: Progress in Particle and Nuclear Physics, Vol. 55, No. 1, 07.2005, p. 12-22.

Research output: Contribution to journalReview article

Faessler, Amand ; Gutsche, Th ; Lyubovitskij, V. E. ; Pumsa-Ard, K. / Chiral dynamics of baryons in a covariant quark model. In: Progress in Particle and Nuclear Physics. 2005 ; Vol. 55, No. 1. pp. 12-22.
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AB - We developed a manifestly Lorentz covariant chiral quark model for the study of baryons as bound states of constituent quarks in an extension of our previous approach. The investigations are related to the ongoing and planned experiments on improved measurements of the elastic baryon form factors and their decay characteristics. The approach is based on a non-linear chirally symmetric Lagrangian, which involves effective degrees of freedom-constituent quarks and the chiral (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 developed by Becher and Leutwyler. 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. These operators are used in the calculation of baryon matrix elements.

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