Workshop on Heavy-Quark Exotics

Session

Day 1 afternoon

19 Feb 2026, 13:20

8. Opening

Takumi DOI (RIKEN)

19/02/2026, 13:20

Opening of the workshop

9. Overview of Lattice QCD

Takumi DOI (RIKEN)

19/02/2026, 13:30

I give an overview on the progress in Lattice QCD.

2. Reconsideration of two-pion exchange potential

Daiki Suenaga (KMI/Nagoya U.)

19/02/2026, 14:10

The HAL computations suggest the ``two-pion exchange potential'' at (semi-)long range regime. In this talk I introduce its theoretical development and explain my ideas.

11. Charmonia scatterings from lattice QCD

Yan Lyu

19/02/2026, 15:20

Recent discoveries in the $J/\psi$-$J/\psi$ spectrum have sparked significant interests in understanding charmonium-charmonium interactions. In this talk, we will show some preliminary results on charmonia scatterings from lattice QCD, with a special focus on interaction mechanism, coupled channel effects, near-threshold properties. Implications to the experimental results will be also mentioned.

12. Di-Jpsi scattering states with the quark Pauli-blocking effects

Sachiko Takeuchi (RCNP, RIKEN Nishina Center)

19/02/2026, 16:00

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...

13. Heavy hadronic molecules and their partners

Yasuhiro Yamaguchi (Nagoya University)

19/02/2026, 17:00

Recent accelerator experiments have reported unexpected states known as exotic hadrons, whose properties cannot be explained by the conventional picture. In the heavy quark sector, $XYZ$, $T_{cc}$, $P_c$ etc. have been reported since the discovery of $X(3872)$. Many exotic hadrons are located near the hadron threshold, and thus hadronic molecular structures have been considered. In this talk,...