Tetra- and penta-quark structures in the constituent quark model

TL;DR

This paper uses a constituent quark model and Gaussian expansion method to analyze and predict the properties of tetraquark and pentaquark states, explaining observed exotic hadrons and proposing new candidates.

Contribution

It systematically investigates heavy tetraquarks and pentaquarks, reproduces experimental data, and offers novel predictions within the constituent quark model framework.

Findings

Reproduces several experimentally observed exotic hadrons.

Analyzes decay widths and spectral patterns of tetraquarks and pentaquarks.

Provides predictions for new exotic states not yet observed.

Abstract

With the development of high energy physics experiments, a large amount of exotic states in the hadronic sector have been observed. In order to shed some insights on the nature of the tetraquark and pentaquark candidates, a constituent quark model, along with the gaussian expansion method, has been employed systematically in the real- and complex-range investigations. We review herein the double- and full-heavy tetraquarks, but also the hidden-charm, -bottom and doubly charmed pentaquarks. Several experimentally observed exotic hadrons are well reproduced within our approach; moreover, their possible compositeness are suggested and other properties analyzed accordingly such as their decay widths and general patterns in the spectrum. Besides, we report also some predictions not yet seen by experiment within the studied tetraquark and pentaquark sectors.