ideas of hyperfine splitting [@FO]. The parameters that are fitted are the quark masses, found to be $m_{u}=m_{d}=250   \pm  5  $ MeV, where it is assumed that $\omega_{u\bar{u}}=\omega_{d\bar{d}}=\omega_{u\bar{d}} = 0.3194$. A similar calculation for the kaon based on the decay constant $f_{K}=113.4   \pm   1.1  $ MeV and the decay rate for $K^{*+}\rightarrow  K^{+} \gamma $, leads to the $s$-quark mass $
m_{s}=0.37  \pm  0.02  $ MeV and the wave function parameter $\omega_{u\bar{s}}=0.3949$ GeV. The values for the masses of $u$- and $s$- quarks and the wave function parameter $\omega_{u\bar{s}}$ obtained in this way are used to evaluate the $K^{*}$ decay constant, $f_{K^{*}}=186.73$ MeV.

Using these values of the quark masses and wave–function parameter we get: $A^{D\rightarrow \rho }_{0}(0)/A^{D\rightarrow
K^{*}}_{0}(0)=0.88$, i.e., an $SU(3)_{F}$–breaking effect at the level of about 10 $\%$. The kinematical factor in eq.(\[eq:OT1\]) readjusts this value and the ratio of the decay rates in terms of the CKM factor becomes $0.96$, which is very close to the $SU(3)_{F}$ symmetry limit. This result for the values of the form factors is not strongly dependent on the choice of wave function. We have calculated the same form factors also with the wave function (\[wf2\]) above and got a similar result. 