Home » Seminars » Exotic hadrons in the hybrid model of hadronic molecules and compact states

## Exotic hadrons in the hybrid model of hadronic molecules and compact states

Closed
KMI Topics
2022-06-15 17:00
Yasuhiro Yamaguchi (H-lab)
ES635 and Zoom

The exotic hadrons have attracted a lot of interest. Their structures cannot be understood by the ordinary hadron picture, a baryon as a three-quark state and a meson as a quark-antiquark state, while the exotics have been reported in the various experimental facilities in Belle@KEK, LHC, etc. The experimental observations indicate that the exotic hadrons have multiquark structures such as a compact five-quark ($qqqq\bar{q}$) state and meson-baryon bound state (called hadronic molecule). However, the exotic hadron problem is still an open question.

To investigate the exotic hadrons, we propose the hybrid model introducing the mixture of the hadronic molecule and compact state. The hadronic molecular component has an important role to
produce the exotics near the hadron threshold. On the other hand, the coupling to the compact state plays a dominant role to provide the strong attraction producing the bound states. We apply this model to X(3872) and Pc pentaquarks and discuss the nature of these exotic hadrons and roles of the interactions.