Analysis of the hidden-charm pentaquark candidates in the $J/\psi \Xi$ mass spectrum via the QCD sum rules

TL;DR

This paper uses QCD sum rules to analyze hidden-charm pentaquark states with specific flavor and spin configurations, predicting their mass spectrum and challenging traditional diquark classifications.

Contribution

It constructs novel five-quark currents and provides the first comprehensive mass spectrum predictions for these pentaquark states.

Findings

Predicted mass spectrum for various $IJ^{P}$ states.

Challenged the conventional scalar and axialvector diquark classification.

Identified the lowest hidden-charm pentaquark states are not scalar-diquark-scalar-diquark-antiquark type.

Abstract

In this work, we construct the color $\bar{\mathbf{3}}\bar{\mathbf{3}}\bar{\mathbf{3}}$ type local five-quark currents with the light quarks $qss$ in the flavor octet, and study the $qssc\bar{c}$ pentaquark states via the QCD sum rules in a comprehensive way, and we emphasize that we achieve two light-flavor octets. We obtain the mass spectrum of the hidden-charm-doubly-strange pentaquark states with the isospin-spin-parity $IJ^{P}=\frac{1}{2}{\frac{1}{2}}^-$, $\frac{1}{2}{\frac{3}{2}}^-$ and $\frac{1}{2}{\frac{5}{2}}^-$, which can be confronted to the experimental data in the future, especially in the process $\Xi_b^- \to P_{css}^-\phi \to J/\psi \Xi^- \phi $. As a byproduct, we observe that the lowest hidden-charm pentaquark states are not of the scalar-diquark-scalar-diquark-antiquark type, it is not suitable to refer to the scalar and axialvector diquarks as the "good" and "bad" diquarks, respectively.