[70,l+] baryons in large Nc QCD revisited: The effect on Regge trajectories

A simple procedure within the 1/Nc expansion method where all the Nc quarks are treated on the same footing has been found successful in describing mixed symmetric negative parity baryon states belonging to the [70,l-] multiplets of the N=1 and 3 bands. Presently it is applied to mixed symmetric positive parity [70,0+] and [70,2+] multiplets of the N=2 band. We search for the most dominant terms in the mass formula. The results are compared to those obtained in the procedure where the system is separated into a core and an excited quark. We find that both the spin and flavor operators of the entire system of Nc quarks play dominant roles in describing the data, like for negative parity states. As a by-product we present the contribution of the leading spin-flavor singlet term as a function of the band number, which hints at distinct Regge trajectories for the symmetric and mixed symmetric states.