Special Issue on Advances in Chiral Quark Models

TL;DR

This special issue reviews recent advances in phenomenological chiral quark models, focusing on exotic hadron candidates and their properties, aiming to bridge the gap between experimental discoveries and QCD-based theories.

Contribution

It compiles recent developments in QCD-motivated phenomenological models for exotic hadrons, highlighting their role in understanding hadron spectroscopy and structure.

Findings

Enhanced understanding of exotic hadron candidates

Development of QCD-inspired phenomenological models

Insights into hadron structure and interactions

Abstract

The number of exotic candidates in both light- and heavy-quark hadron sectors has increased dramatically since the discovery by the Belle Collaboration of the so-called $X(3872)$ in 2003. It is clear that the simple quark model picture needs an extension and thus the last twenty years have witnessed an explosion of related theoretical and experimental activity. The ultimate goal of theory is to describe the properties of exotic states from the first principles of Quantum Chromodynamics (QCD), which is the non-Abelian Quantum Field Theory that describes the strong interaction. However, since this task is quite challenging, a more modest goal to start with is the development of QCD-motivated phenomenological models that specify the colored constituents, how they are clustered, and the forces between them. This Special Issue invited contributions reporting recent advances of phenomenological quark models in the study of hadron's spectrocopy, structure, and interactions, paying special attention to the exotic candidates but without losing sight of the conventional states. In response to the call for papers, and after a comprehensive peer review process, 8 articles qualified for acceptance in the final edition of the Special Issue. The authors are from geographically distributed countries such as Spain, South Africa, Ghana, China, Brazil, Argentina. This reflects the impact of the proposed topic and the effective organization of the guest editorial team of this Special Issue.