Speaker
Description
The Quantum Chromo-Dynamics (QCD) at low energy is characterized by spontaneous breaking of chiral symmetry and color confinement. They are induced by topological vacuum configuration of the gluon filed (instanton). However, it has not yet been clarified very clearly how they work in forming hadrons. We will perform spectroscopic studies of baryon with heavy flavors, through which we could learn dynamics of quarks and gluons at low energy.
By introducing a heavy quark in a baryon, we could disentangle a relative motion of the heavy quark to the other light quark pair ($\lambda$ mode) and an internal motion of the light quark pair ($\rho$ mode). The light quark pair is expected to form a diquark correlation though the color magnetic interaction.
In this presentation, we will discuss systematics of level structure of singly heavy baryons classifying into $\lambda$/$\rho$-mode excitations. The $\lambda$-mode excitations calculated in the quark-diquark configuration indicate a so-called string tension puzzle. In the $\rho$-mode excitations, we will show an effect of instanton-induced interactions. These effects will be able to investigate at J-PARC.