Speaker
Description
In recent years, there has been growing interest in exotic hadrons that exhibit structures beyond the conventional hadron picture, where baryons are treated as three-quark states ($qqq$) and mesons as quark-antiquark ones ($q\bar{q}$). In the charm sector, many exotic hadrons such as $XYZ$, $P_c$, and $T_{cc}$ have been reported in experiments. Most of these states have appeared near hadron thresholds and hence have been considered as hadronic molecular states. Although the hadron-hadron interactions are responsible for binding constituent hadrons, they are not yet fully understood. Understanding hadronic interactions is essential for uncovering the dynamics of low-energy QCD.
In this talk, we discuss hadronic molecules including heavy mesons (such as $\bar{D}$ or $B$ mesons), focusing on their bound and resonant states. Heavy mesons are expected to be constituents of many hadronic molecular states, and thus understanding their interactions is very important to investigate the exotic hadrons. In the heavy hadron sector, the heavy quark symmetry is a key ingredient, which induces channel coupling effects and also predicts spin partner states. We study properties of hadronic molecules of a heavy meson and a nucleon within the meson exchange model.