Probing the nature of the anticharmed-strange pentaquark states: mass spectra, decays, and magnetic moments

TL;DR

This study predicts multiple bound and resonance states of anticharmed-strange pentaquarks using a quark model, providing specific mass and decay width estimates to guide future experimental searches.

Contribution

It offers the first systematic prediction of bound and resonance states of anticharmed-strange pentaquarks with detailed mass spectra and decay properties using the resonance group method.

Findings

Predicted three bound states with masses 2886, 3039, and 3153 MeV.

Identified three resonance states with specific decay widths and masses.

Provided detailed quantum numbers and decay channels for potential experimental detection.

Abstract

Within the framework of the quark delocalization color screening model, a systematic investigation of the anticharmed-strange pentaquark system is performed using the resonance group method. The currently estimations predict three bound states with estimated masses to be 2886 MeV, 3039 MeV, and 3153 MeV, respectively. Additionally, three resonance states are identified in various scattering phase shifts processes. Among them, two resonance states $\Sigma D$ and $\Sigma^{\ast}D^{\ast}$ with quantum number $\frac{1}{2}(\frac{1}{2}^{-})$ are detected in channels $ND_{s}^{\ast}$ and $ND$, and $\Sigma D^{\ast}$ and $\Lambda D$, with masses and decay widths of ($M_{R}=3053\sim3055$ MeV, $T_{total}=13.0\sim13.4$ MeV) and ($M_{R}=3389\sim3390$ MeV, $T_{total}=10.4$ MeV), respectively. In the $\Lambda D^{\ast}$ and $\Sigma D^{\ast}$ channels, a resonance state with quantum number $\frac{1}{2}(\frac{3}{2}^{-})$ is discovered, with its mass and decay width being $3250\sim3252$ MeV and 4.4 MeV, respectively. These predicted pentaquark states have $\bar{c}snnn$ quark compositions, allowing them to be recognized as genuine pentaquark states. To validate these predictions, it is expected that upcoming experiments will further explore the predicted resonance and bound states in these possible decay channels.