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 |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
- Mathematical Physics
Cite this
Sigma-term physics in the perturbative chiral quark model. / Lyubovitskij, V. E.; Gutsche, Th; Faessler, Amand; Drukarev, E. G.
In: Physical Review D, Vol. 63, No. 5, 054026, 2001.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Sigma-term physics in the perturbative chiral quark model
AU - Lyubovitskij, V. E.
AU - Gutsche, Th
AU - Faessler, Amand
AU - Drukarev, E. G.
PY - 2001
Y1 - 2001
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0034907628&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034907628&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.63.054026
DO - 10.1103/PhysRevD.63.054026
M3 - Article
VL - 63
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 1550-7998
IS - 5
M1 - 054026
ER -