Speaker
Description
Quantum Chromodynamics (QCD) has been firmly established as the fundamental theory of the strong interaction, and lattice QCD calculations have successfully bridged QCD and nuclear systems; however, the mechanism by which quarks build hadrons remains unresolved, particularly for excited states and exotic multiquark configurations that reflect the non-trivial dynamics of the low-energy QCD vacuum. Spin-dependent attractive interactions give rise to strong quark-pair correlations known as the diquark correlation, most prominently the scalar $0^+$ good diquark, which serve as crucial effective degrees of freedom not only in hadron spectroscopy and exotic structures, but also in dense hadronic matter and the color superconducting phase. To experimentally uncover these internal dynamics, systematic spectroscopic studies of charmed ($\Lambda_c$) and multistrange ($\Xi$,$\Omega$) baryons are proposed at J-PARC using high-momentum hadron beams. By exploiting excited states within diquarks composed of different flavor combinations ($u$,$d$,$s$), experiments at the $\pi 20$ ($\Lambda_c$,$\Xi$) and K10 ($\Omega$) beamlines aim to isolate these diquark degrees of freedom and firmly establish the diquark correlation which is essential for the hadron structure.
