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

TL;DR

This paper explores the possibility of strange quark analogs to known pentaquark states, proposing experimental channels to detect potential $sar s uud$ resonances near kinematic endpoints.

Contribution

It introduces a feasible experimental approach to search for strange pentaquark states analogous to known charm pentaquarks, focusing on specific decay channels.

Findings

Feasibility of detecting $P_s^+$ near kinematic endpoint.

Limited phase space constrains evidence to endpoint region.

Proposes $ ext{Lambda}_c o ext{phi} ext{pi}^0 p$ decay channel.

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, $\Lambda_c \to \phi \pi^0 \! p$, 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.