RARiS 研究会「実験、反応・構造計算、格子QCD で解き明かすハドロン分光 2024」

Mixture of χcJ(2P) and Hadronic Molecules

Nov 21, 2024, 2:15 PM

20m

　三神峯ホール (東北大学先端量子ビーム科学研究センター)

Session1@Mikamine

Speaker

Kotaro Miyake (Nagoya University)

Description

"Some hadrons are difficult to explain as normal hadrons made of quark-antiquark pairs or three quarks. These are called exotic hadrons. Since the Belle experiment discovered $X(3872)$ in 2003, more exotic hadrons containing charm quarks have been reported. Exotic hadrons likely have more complex structures than normal hadrons, but this is still uncertain.

The $X(3872)$ is one of the most well-known exotic hadrons and has been observed in many experiments. It has the same quantum numbers as ${\chi }_{c1}(2P)$, but its mass differs from the quark model's prediction. It is also very close in mass to the $D^0{\overline{D}}^{\ast 0}$ threshold, with only a 0.04 MeV difference.

In this study, we analyze ${\chi }_{cJ}(2P)$ as a mixture of a hadronic molecule state, similar to a deuteron, and a bare ${\chi }_{cJ}(2P)$ core, comparing it to $X(3872)$ and others."