Kaonic nuclei are exotic few-body systems in which an antikaon is bound as a constituent particle. They provide a unique testing ground for the strongly attractive subthreshold $\bar{K}N$ interaction and the resulting few-body dynamics. In the J-PARC E15 experiment, the simplest candidate, the ''$K^-pp$'' state, was observed as a structure in the $\Lambda p$ invariant-mass spectrum of the...
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...
Nucleon resonances (N and Δ) have been studied for a long time mostly through
γN→πN. πN→πN, and γN→ππN reactions. However, there are many resonances which
have not been established experimentally, due to a limited number of πN→ππN reaction
data which was mainly measured in 1970’s. Thus, J-PARC E45 has been proposed to
study nucleon resonances in πN→ππN reactions with high-intensity π±...
