Singly heavy Cascade Baryon $\Xi^0_{c}$ \& $\Xi^-_{b}$ Spectroscopy in the Relativistic Framework of Independent Quark Model

TL;DR

This paper applies a reduced-parameter relativistic independent quark model to study the spectroscopy, electromagnetic properties, and decay processes of singly heavy baryons $\\Xi_c^0$ and $\\Xi_b^-$, providing theoretical assignments and predictions consistent with experimental data.

Contribution

It introduces a systematic parameter reduction in the relativistic quark model and applies it to baryon spectroscopy, decay widths, and magnetic moments, offering new theoretical insights and predictions.

Findings

Assigned spin-parity to several observed baryon states.

Calculated magnetic moments and decay widths consistent with experimental data.

Predicted branching ratios for future experimental verification.

Abstract

In this work, the potential parameters of the independent quark model are systematically reduced using previously determined inputs from a broad range of baryons. The reduced-parameter formulation, developed within the relativistic Dirac formalism and employing a Martin-like potential, is then applied to the spectroscopy of the singly heavy baryons $\Xi_c^0$ and $\Xi_b^-$. This enables an explicit verification of the linear relation obtained between the potential parameters. Radially and orbitally excited state masses are calculated, and the resulting Regge trajectories are used to assign spin-parity to experimentally observed states. The states $\Xi_c^0(2923)$, $\Xi_c^0(3080)$, $\Xi_c^0(2882)$, and $\Xi_c^0(2970)$ are identified as having $J^P = \tfrac{1}{2}^-$, $\tfrac{3}{2}^+$, $\tfrac{3}{2}^-$, and $\tfrac{1}{2}^+$, respectively, while the observed $\Xi_b^-(6227)$ state is assigned $J^P = \tfrac{5}{2}^+$. To investigate the electromagnetic structure of these baryons, their magnetic moments and radiative decay widths are computed. Additionally, the two-body weak decay branching ratios of $\Xi_c^0$ are evaluated and contrasted with experimental data to assess the robustness of the approach. The two-body nonleptonic decays of $\Xi_b^-$ are also analyzed, providing predictions for branching ratios that may be tested in future experiments. Overall, the results demonstrate the effectiveness of the parameter-reduction procedure and support its applicability in the spectroscopy of baryons.