Do the $P_c^{+}$ Pentaquarks Have Strange Siblings?

Abstract

The recent LHCb discovery of states $P_c^{+}(4380)$, $P_c^{+}(4450)$, believed to be $c\bar{c}uud$ pentaquark resonances, begs the question of whether equivalent states with $c\bar{c}\to s\bar{s}$ exist, and how they might be produced. The precise analogue to the $P_c^{+}$ discovery channel ${\Lambda }_b\to J/\psi K^{-}p$, namely, ${\Lambda }_c\to \varphi {\pi }^{0}p$, is feasible for this study and indeed is less Cabibbo-suppressed, although its limited phase space suggests that evidence of a $s\bar{s}uud$ resonance $P_s^{+}$ would be confined to the kinematic endpoint region.

Comments: 5 pages, 1 pdf figure, REVTeX. Version accepted for publication in Phys. Rev. D