Meson–baryon coupling constants of the SU(3) baryons with flavor SU(3) symmetry breaking

Abstract

We investigate the strong coupling constants for the baryon octet-octet, decuplet-octet, and decuplet-decuplet vertices with pseudoscalar mesons within a general framework of the chiral quarksoliton model, taking into account the effects of flavor SU(3) symmetry breaking to linear order in the expansion of the strange current quark mass. All relevant dynamical parameters are fixed by using the experimental data on hyperon semileptonic decays and the singlet axial-vector constant of the nucleon. The results of the strong coupling constants for the baryon octet and the pseudoscalar meson octet are compared with those determined from the Jülich-Bonn potential and the Nijmegen extended soft-core potential for hyperon-nucleon scattering. The results of the strong decay widths of the baryon decuplet are in good agreement with the experimental data. The effects of SU f (3) symmetry breaking are sizable on the η ′ coupling constants. We predict also the strong coupling constants for the Ω baryons.

Electromagnetic transition form factors, E2/M1 and C2/M1 ratios of the baryon decuplet

“…In Ref. [63] the strong decay widths of the baryon decuplet were scrutinized based on the χ QSM in a model-independent approach, where all the dynamical parameters were fixed by experimental data without calculating them self-consistently. While the strong decay width of the is still underestimated, the widths of all the other members of the baryon decuplet are in good agreement with the experimental data.…”

Electromagnetic Form Factors of the Baryon Decuplet

“…In Ref. [48] the strong decay widths of the baryon decuplet were scrutinized based on the χQSM in a model-independent approach, where all the dynamical parameters were fixed by experimental data without calculating them self-consistently. While the strong decay width of the ∆ is still underestimated, the widths of all the other members of the baryon decuplet are in good agreement with the experimental data.…”

Axial-vector transition form factors of the baryon octet to the baryon decuplet with flavor SU(3) symmetry breaking

“…The meson-baryon strong coupling constants have been already investigated in this pion mean-field approach, where all dynamical parameters were fixed by the experimental data on HSDs [62]. We want to mention that the GTR has a certain discrepancy [106].…”

“…The axial-vector transition constants from the baryon decuplet to the octet with the strangeness conserved (∆S = 0) were already computed within the chiral quark-soliton model (χQSM) [61]. Those with |∆S| = 1 were investigated in a pion mean-field approach, where all possible parameters were fixed by using the experimental data on HSD [62]. In the present work, we will extend the previous study to compute all possible axial-vector transition form factors from the baryon decuplet to the octet up to a momentum transfer Q 2 ≤ 1 GeV 2 within the framework of the self-consistent χQSM with explicit flavor SU(3) symmetry breaking considered.…”