LARGE N-C UNIVERSALITY OF THE BARYON ISGUR-WISE FORM-FACTOR - THE GROUP THEORETICAL APPROACH

In a previous article, it was proved in the framework of the chiral so liton model that the same Isgur-Wise form factor describes the semilep tonic Lambda(b)-->Lambda(c) and Sigma(b)(())-->Sigma(c)((*)) decays i n the large N-c limit. It is shown here that this result is in fact in dependent of the chiral soliton model and is solely the consequence of the spin-flavor SU(4) symmetry which arises in the baryon sector in t he large N-c limit.