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Taking into account the $SU(3)_f$ breaking effects, the strong couplingconstants of the $\pi$, $K$ and $\eta$ mesons with decuplet baryons arecalculated within light cone QCD sum rules method. It is shown that allcoupling constants, even in the case of $SU(3)_f$ breaking, are described interms of only one universal function. It is shown that for $\Xi^{\ast 0} \to\Xi^{\ast 0} \eta $ transition violation of $SU(3)_f$ symmetry is very largeand for other channels when $SU(3)_f$ symmetry is violated, its maximum valueconstitutes $10%\div15%$.

Pseudoscalar--meson decuplet--baryon coupling constants in light cone QCD