Abstract
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 language | English |
|---|---|
| Article number | 054026 |
| Journal | Physical Review D |
| Volume | 63 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2001 |
| Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
- Mathematical Physics
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Lyubovitskij, V. E., Gutsche, T., Faessler, A., & Drukarev, E. G. (2001). Sigma-term physics in the perturbative chiral quark model. Physical Review D, 63(5), [054026]. https://doi.org/10.1103/PhysRevD.63.054026