Do the Pc+ pentaquarks have strange siblings?

The recent LHCb discovery of states Pc+(4380), Pc+(4450), believed to be cc¯uud pentaquark resonances, begs the question of whether equivalent states with cc¯→ss¯ exist, and how they might be produced. The precise analogue to the Pc+ discovery channel Λb→J/ψK-p, namely, Λc→φπ0p, is feasible for this study and indeed is less Cabibbo suppressed, although its limited phase space suggests that evidence of a ss¯uud resonance Ps+ would be confined to the kinematic end-point region.