Strange baryon spectroscopy in the relativistic quark model

TL;DR

This paper calculates the mass spectra of strange baryons using a relativistic quark-diquark model, successfully matching experimental data and predicting fewer excited states than traditional three-quark models.

Contribution

It introduces a relativistic quark-diquark framework that accounts for diquark internal structure and excitations, providing improved mass predictions for strange baryons.

Findings

Accurately reproduces masses of well-established strange baryons.

Constructs Regge trajectories for strange baryons.

Predicts fewer excited states than three-quark models.

Abstract

Mass spectra of strange baryons are calculated in the framework of the relativistic quark model based on the quasipotential approach. Baryons are treated as the relativistic quark-diquark bound systems. It is assumed that two quarks with equal constituent masses form a diquark. The diquark excitations and its internal structure are consistently taken into account. Calculations are performed up to rather high orbital and radial excitations of strange baryons. On this basis the Regge trajectories are constructed. The obtained results are compared with available experimental data and previous predictions. It is found that all masses of the 4- and 3-star, as well as most of the 2- and 1-star states of strange baryons with established quantum numbers are well reproduced. The developed relativistic quark-diquark model predicts less excited states than three-quark models of strange baryons.