Speaker
Sachiko Takeuchi
(RCNP, RIKEN Nishina Center)
Description
The scattering states of the double-charmonium, such as $J/\psi J/\psi$, $\eta_c J/\psi$, and $\eta_c\eta_c$, are investigated by a simplified quark cluster model focusing on the Pauli principle over the quarks.
We found that its effects on the $c\bar cc\bar c$ quark system can be expressed by a two-meson potential, which has a long-range repulsion with a short-range attraction.
This Pauli-blocking effect gives rise to a node in the scattering phase shift at a specific energy, which is also seen in the cross sections.
We will also demonstrate how the correlation function from heavy ion collisions is affected by this Pauli-blocking effect and also discuss possible coupling to the relative $P$-wave $\chi_{cJ}J/\psi$ channel.
Author
Sachiko Takeuchi
(RCNP, RIKEN Nishina Center)
Co-authors
Atsushi Hosaka
(RCNP, Osaka University)
Makoto Takizawa
(Showa Pharmaceutical University)
Yasuhiro Yamaguchi
(Nagoya University)