Weak electric and magnetic form factors for semileptonic baryon decays in an independent-quark model

Weak electric and magnetic form factors for semileptonic baryon decays are calculated in a relativistic quark model based on the Dirac equation with the independent-quark confining potential of the form (1+${\gamma }^0$)V(r). The values obtained for ($g_2$/$g_1$), for various decay modes in a model with V(r)=a’ $r^2$, are roughly of the same order as those predicted in the MIT bag model. However in a similar model with V(r)=($a^{\nu +1\mathrm{}}$ $r^{\nu }$+$V_0$), the ($g_2$/$g_1$) values agree with the nonrelativistic results of Donoghue and Holstein. Incorporating phenomenologically the effect of nonzero $g_2$ in the ratio ($g_1$/$f_1$), we have estimated the values for ($f_2$/$f_1$) for various semileptonic transitions. It is observed that SU(3)-symmetry breaking does not generate significant departures in ($f_2$/$f_1$) values from the corresponding Cabibbo values.