Exploration of the LHCb Pc states and possible resonances in aunitary coupled-channel model

We extend our previous study of the interactions of (D) over bar (()*())Lambda(c)- (D) over bar (()*())Sigma(()(c)*())within an analytic, unitary, coupled-channel approach by including the J/psi p channel and per-forming fits to theJ/psi pinvariant mass distributions in the Lambda(0)(b)-> J/psi pK-decay by the LHCb Collaboration. We takeinto account the contributions oft-channel pseudoscalar andvector meson exchanges andu-channel baryon exchanges inthis work, and a series of bound states and resonances withdifferent spin-parities are dynamically generated. Accordingto the results, four states have a significant impact on thephysical observables, with two having a spin-parity of 1/2(-)and the other two having 3/2(-). These states can be associ-ated with the LHCb hidden-charm pentaquarks. We furtherprovide the coupling strength between each pole and differ-ent channels, which provides some insights on how to searchfor them in future experiments. Moreover, we also search forpoles in higher partial waves up toJ=7/2 and find indica-tions for the existence of several states with larger widths