Possible charmed-strange molecular pentaquarks in quark delocalization color screening model

TL;DR

This paper predicts new charm-strange pentaquark states using a quark delocalization color screening model, providing theoretical guidance for future experimental searches of exotic hadrons.

Contribution

It introduces a systematic study of charm-strange pentaquarks with the resonance group method, predicting several bound and resonance states with specific masses and decay widths.

Findings

Predicted bound states: $ ext{Σ}_c^* K^*$ and $ ext{Δ} D_s^*$ with specific quantum numbers.

Predicted resonance states: $ ext{Σ}_c K^*$ and $ ext{Δ} D_s^*$ with calculated masses and decay widths.

Provides theoretical mass spectra and decay properties for potential experimental verification.

Abstract

Inspired by the states $T_{c\bar{s}0}^{a}(2900)^{0}$ and $T_{c\bar{s}0}^{a}(2900)^{++}$ reported by the LHCb Collaboration, we carry out a systematical investigation of the charm-strange pentaquark system using resonance group method in the quark delocalization color screening model. The present results predict the existence of some bound states and resonance states with support from the study of the mass spectrum and the decay properties. Both $\Sigma_{c}^{\ast}K^{\ast}$ with $I(J^{P})=\frac{1}{2}(\frac{5}{2}^{-})$ and $\Delta D_{s}^{\ast}$ with $I(J^{P})=\frac{3}{2}(\frac{5}{2}^{-})$ are bounded by channel coupling calculation. Moreover, the resonance state $\Sigma_{c}K^{\ast}$ with $I(J^{P})=\frac{1}{2}(\frac{1}{2}^{-})$ and $I(J^{P})=\frac{1}{2}(\frac{3}{2}^{-})$ are available in QDCSM, the masses and the total decay widths of which are ($R^{\prime}=3342\sim3346$ MeV, $\Gamma_{Total}=25.5$ MeV) and ($R^{\prime}=3333$ MeV, $\Gamma_{Total}=3.3$ MeV), respectively. In addition, the resonance state $\Delta D_{s}^{\ast}$ with $I(J^{P})=\frac{3}{2}(\frac{1}{2}^{-})$ is also obtained, the mass and the decay width of this state are 3343 MeV and 0.01 MeV, respectively. These predicted new exotic states may provide new ideas for experimental searches and we sincerely expect more experimental and theoretical research to verify and understand the charm-strange pentaquark states in the future.