Investigation of $\Xi_c^0$ in a chiral quark model

TL;DR

This paper investigates newly observed $\\Xi_c^0$ states using a chiral quark model, exploring three- and five-quark structures to identify potential resonance candidates and compare with experimental data.

Contribution

It introduces a comprehensive analysis of $\\Xi_c^0$ states with both three- and five-quark configurations using the chiral quark model and Gaussian expansion method.

Findings

2$S$ states of $\Xi_c'$ and $\Xi_c$ match experimental results

Resonance states of five-quark configurations are potential candidates for new states

Decay widths of these states are calculated

Abstract

Recently, three new states of $\Xi_c^0$ were observed in the invariant mass spectrum of $\Lambda^+_cK^-$ by LHCb collaboration. In this work, we use a chiral quark model to investigate these three exited states with the help of Gaussian expansion method both in three-quark structure and in five-quark structure with all possible quantum numbers $IJ^P=\frac{1}{2}(\frac{1}{2})^-$, $\frac{1}{2}(\frac{3}{2})^-$, $\frac{1}{2}(\frac{5}{2})^-$, $\frac{3}{2}(\frac{1}{2})^-$, $\frac{3}{2}(\frac{3}{2})^-$ and $\frac{3}{2}(\frac{5}{2})^-$ . The calculations shows that the 2$S$ states of $\Xi_c'(2579)^0$ and $\Xi_c(2645)^0$ are comparable to experimental results; In addition, the resonance states of five-quark configuration are possible candidates of these new states with negative parity by using the real scaling method and their decay width are also given.