Rich structure of the hidden-charm pentaquarks near threshold regions

TL;DR

This paper develops a coupled-channel model for hidden-charm pentaquarks with strangeness, successfully reproducing known states and predicting new molecular states near threshold regions for future experimental study.

Contribution

It introduces a novel coupled-channel framework combining molecular and five-quark states for hidden-charm pentaquarks with strangeness, aligning with recent experimental discoveries.

Findings

Reproduces the mass and quantum numbers of P_{cs}(4338).

Predicts new P_{cs} molecular states near threshold regions.

Provides a theoretical basis for future LHCb investigations.

Abstract

The recent abundant observations of pentaquarks and tetraquarks by high-energy accelerator facilities indicate the realization of the conjecture by Gell-Mann and Zweig, and by De Rujula, Georgi and Glashow [1-3]. We construct a coupled-channel model for the hidden-charm pentaquarks with strangeness whose quark content is $udsc \bar c$, $P_{cs}$, described as $ \Lambda_c \bar{D}_s^{(*)}, \Xi_c^{('*)} \bar{D}^{(*)}$ molecules coupled to the five-quark states. These molecules are formed by the suitable cooperation of heavy quark and chiral symmetries. We reproduce the experimental mass and quantum numbers $J^P$ of $P_{cs}(4338)$ for which LHCb has just announced the discovery. We make other predictions for new $P_{cs}$ states as molecular states near threshold regions that can be studied by LHCb.