Meson-octet-baryon couplings using light cone QCD sum rules

Abstract

The coupling constants of $K$ and $\ensuremath{\pi}$ mesons with the octet baryons are studied in light cone QCD sum rules taking into account $\mathrm{SU}(3{)}_{f}$ flavor symmetry breaking effects, but keeping the $\mathrm{SU}(2)$ isospin symmetry intact. It is shown that, in the $\mathrm{SU}(3{)}_{f}$ flavor symmetry breaking case, all of the couplings can be written in terms of four universal functions instead of $F$ and $D$ couplings which exist in the $\mathrm{SU}(3{)}_{f}$ symmetry case. A comparison of our results of kaon and pion-baryon couplings with existing theoretical and experimental results in the literature is performed.