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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Focus Session III: Multiquark and Molecular States

HK 60.2: Invited Talk

Thursday, March 14, 2024, 14:30–15:00, HBR 14: HS 1

Cross-Experiment Insights into Multiquarks and Molecular States — •Mikhail Mikhasenko — Ruhr Univerity Bochum

This presentation delves into the forefront of hadronic physics, focusing on the intriguing realm of exotic hadrons. I will specifically address two compelling means of matter organization: the genuine Quantum Chromodynamics state, a conventional meson or a baryon, conceptualized as a single 'bag' of quarks, and the hadronic molecule arrangement, where two 'bags' are bound by residual nuclear forces. Central to discussion is the critical role of hadron-hadron rest energy, serving as the reference point for molecular binding.

Recent years have witnessed a proliferation of experimental evidence suggesting a surplus of hadronic states beyond conventional mesons and baryons. Notably, several of these states appear tantalizingly close to the hadron-hadron threshold, suggesting their molecular interpretation and blurring the lines between particle and nuclear physics.

The talk will provide a review of these experimental observations, highlighting their significance in understanding the true nature of multiquark states. I'll aim to shed light on the potential of these exotic states to redefine our understanding of matter organization at a fundamental level.

Keywords: hadron spectroscopy; exotic states; hadronic molecules; multiquark states; experiment