Sigma-term physics in the perturbative chiral quark model

V. E. Lyubovitskij, Th Gutsche, Amand Faessler, E. G. Drukarev

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)


We apply the perturbative chiral quark model at one loop to analyze meson-baryon sigma terms. Analytic expressions for these quantities are obtained in terms of fundamental parameters of low-energy pion-nucleon physics (weak pion decay constant, axial nucléon coupling, strong pion-nucleon form factor) and of only one model parameter (radius of the nucleonic three-quark core). Our result for the πN sigma term σπN ≈45 MeV is in good agreement with the value deduced by Gasser, Leutwyler, and Sainio using dispersionrelation techniques and exploiting the chiral symmetry constraints.

Original languageEnglish
Article number054026
JournalPhysical Review D
Issue number5
Publication statusPublished - 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

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