New strange pentaquarks

TL;DR

This paper analyzes the nature of newly observed strange pentaquarks, proposing they are hadronic molecules similar to non-strange pentaquarks, and predicts three additional states with specific mass shifts.

Contribution

It introduces the hypothesis that strange pentaquarks are hadronic molecules and predicts three new states based on this model.

Findings

Strange pentaquarks are likely hadronic molecules of  ar D and  ar D*.

Comparison with non-strange pentaquarks supports the molecular interpretation.

Predicts three new strange pentaquarks with higher masses.

Abstract

The new strange pentaquarks observed by LHCb are very likely hadronic molecules consisting of $\Xi_c \bar D$ and $\Xi_c \bar D^{*}.$ We discuss the experimental evidence supporting this conclusion, pointing out the similarities and differences with the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ pentaquarks in the non-strange sector. The latter clearly are hadronic molecules consisting of $\Sigma_c \bar D$ and $\Sigma_c \bar D^{*}.$ Following this line of thought, we predict three additional strange pentaquarks, consisting of $\Xi_c^{\prime} \bar D$ and $\Xi_c^{\prime} \bar D^{*}.$ The masses of these states are expected to be shifted upwards by $M(\Xi_c^{\prime})-M(\Xi_c) \approx 110$ MeV with respect to the corresponding known strange pentaquarks.