N Σc and N Σb resonances in the quark-delocalization color-screening model

The N Lambda(c) and N Lambda(b) systems with I = 1/2 and J(P) = 0(+) or 1(+) are investigated within the framework of the quark delocalization color screening model (QDCSM) by solving a resonating group method equation. The results show that the interaction between N and Lambda(c) is attractive, but it is not strong enough to form any N Lambda(c) bound state, even with the help of channel coupling. Whereas the attraction between N and Sigma(c) is strong enough to form a bound state N Sigma(c) (S-3(1)), it becomes a resonance state with the resonance mass of 3389-3404 MeV by coupling to the open N Lambda(c) D-wave channel. However it does not show up in the N Lambda(c) S-wave channel. The corresponding states N Lambda(b), N Lambda(b) have similar properties as that of states N Lambda(c), N Lambda(c), and there exists a N Sigma(b) (S-3(1)) resonance state with energy of 6733-6743 MeV in the N Lambda(b) D-wave scattering phase shifts. DOI: 10.1103/PhysRevC.87.034002