R-Matrix Calculations for Few-Quark Bound States

TL;DR

This paper applies the R-matrix method to compute the mass spectrum and sizes of heavy quark bound states, including diquarks, triquarks, tetraquarks, and pentaquarks, comparing results with other theoretical and experimental data.

Contribution

It introduces the R-matrix approach in configuration space for studying complex heavy quark systems, providing new mass and size calculations for these states.

Findings

Calculated masses agree with recent theoretical results.

Mass spectra are consistent with experimental data.

Provides detailed size estimates for various quark bound states.

Abstract

The R--matrix method is implemented to study the heavy charm and bottom diquark, triquark, tetraquark and pentaquarks in configuration space, as the bound states of quark--antiquark, diquark--quark, diquark--antidiquark and diquark--antitriquark systems, respectively. The mass spectrum and the size of these systems are calculated for different partial wave channels. The calculated masses are compared with recent theoretical results obtained by other methods in momentum and configuration spaces and also by available experimental data.