Workshop on Heavy-Quark Exotics

Session

Day 2 morning

20 Feb 2026, 09:30

20. Lattice QCD studies on (anti)kaon-nucleon interactions and exotic states

Kotaro Murakami (Institute of Science Tokyo)

20/02/2026, 09:30

Elucidating the nature of exotic hadrons is one of the central challenges in hadron physics. In recent years, numerical simulations based on lattice QCD have become a powerful tool for investigating these hadrons from first principles. The HAL QCD method, which explores hadron interactions in lattice QCD through interaction potentials, has demonstrated particular advantages for systems...

6. Insights into the Kbar N interaction and Lambda(1405) through model analysis of HAL QCD results

Takayasu Sekihara (Kyoto Prefectural University)

20/02/2026, 10:10

The HAL QCD method has been established as a reliable method to study hadron-hadron interactions. However, in the $\bar{K} N$ potential, which dynamically generates the $\Lambda (1405)$ as the bound state, singular behavior around the origin has been observed. In order to clarify the cause of such behavior in the HAL QCD method, we calculate the R-correlators and local potentials in an...

14. Study of Tcc based on a model including compact and molecule states, and a diquark model.

Masayasu Harada (KMI, Nagoya University)

20/02/2026, 11:20

I will summarize main points of the following two works.
[1] S. Ampuku, Y. Yamaguchi and M. Harada, [arXiv:2511.13003 [hep-ph]].
We develop a model that incorporates mixing between hadronic-molecular and compact multiquark components. We then apply this framework to the specific case of the Tcc and analyze the peak structure in the D0-D0-pi+ invariant-mass spectrum reported by LHCb. We find...

7. Compositeness of near-threshold states in charged few-body systems

Tomona Kinugawa (RIKEN)

20/02/2026, 12:00

In recent years, an increasing number of exotic hadrons have been observed, many of which appear near scattering thresholds. In this work, we focus on near-threshold states in systems governed by both short-range and Coulomb interactions, and calculate the compositeness to quantify their internal structure. When the Bohr radius $a_B$ is larger than the magnitude of the effective range $|r_e|$,...