Work

Baryons and baryoniums in the perspective of QCD sum rules

Year: 2026

Type: article

Abstract: Following the experimental confirmation of tetraquark and pentaquark states, the search for hexaquark states has emerged as a new frontier in hadron physics. The recent observation of $$X(1840)$$ and $$X(1880)$$ by BESIII collaboration has provided evidence for the predicted $$p\bar{p}$$ bound states. Such baryon-antibaryon configurations, encompassing both bound states and resonances, are commonly referred to as baryoniums and are regarded as promising hexaquark candidates. In this article, we provide a comprehensive review of the investigations into baryonium states and their constituents, i.e., baryons, within the framework of QCD sum rules. We delineate the fundamental calculation procedures of this method to facilitate its practical application and benchmark the theoretical predictions against alternative models as well as the latest experimental data.

Source: AAPPS bulletin

DOI: 10.1007/s43673-026-00192-y

Authors: Sheng-Qi Zhang, Cong-Feng Qiao

Institutions: Chinese Academy of Sciences, Peking University, University of Chinese Academy of Sciences

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,190

Funder: National Key Research and Development Program of China