1/N_c Expansion of the Heavy Baryon Isgur-Wise Functions

Abstract

The 1/N_c expansion of the heavy baryon Isgur-Wise functions is discussed. Because of the contracted SU(2N_f) light quark spin-flavor symmetry, the universality relations among the Isgur-Wise functions of \Lambda_b to \Lambda_c and \Sigma_b^{(*)} to \Sigma_c^{(*)} are valid up to the order of 1/N_c^2.

Comments: 7 pages, latex, no figures, to appear in Phys. Rev. D