Parametrization of the semileptonic baryon matrix elements

We present a general parametrization of the semileptonic decays of the baryons obtained, as for the magnetic moments, performing a unitary transformation that connects the exact states to the model states. We show that again the nonrelativistic-quark-model (NRQM) description amounts to selecting certain terms among those of the general parametrization; in the no-flavor-breaking approximation the parametrization contains two parameters ($a$ and $b$) linearly related to the Cabibbo's $D$, $F$ and associated, in the NRQM language, to the one-quark and two-quark terms. The NRQM amounts to keeping the largest (one-quark) term with a coefficient $a(\simeq 0.75)$; $b$ is 3-10% of $a$. Finally, we clarify the variety of possible terms that appear on going beyond the flavor symmetric approximation.