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Takumi DOI (RIKEN)19/02/2026, 13:20
Opening of the workshop
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Takumi DOI (RIKEN)19/02/2026, 13:30
I give an overview on the progress in Lattice QCD.
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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.
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Yan Lyu19/02/2026, 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.
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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.
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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.
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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,...
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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...
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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...
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Masayasu Harada (KMI, Nagoya University)20/02/2026, 11:20
I will summarize main points of the following two works.
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[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... -
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 $|r_e|$,...
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Dr Wren Yamada (RIKEN)20/02/2026, 13:40
The $\bar{D}N$ system is one of the most fundamental systems involving charmed mesons and nucleons. However, experimental data are scarce, and effective models do not constrain the low-energy scattering parameters well. I will report the results of my analysis on the "HAL-conf-2023" LQCD data concerning the $\bar{D}N$ channel.
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Yuki Kamiya (Yukawa Institute for Theoretical Physics, Kyoto University)20/02/2026, 14:20
The femtoscopic study using the momentum correlation function from the high-energy collisions provides new insights for the hadron interactions. The correlation function is known to be sensitive to the low-energy interaction and the particle emission source. In addition, the femtoscopy approach is advantageous for the charm sector which is not easily studied by the traditional scattering...
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Makoto Takizawa (Showa Pharmaceutical University)20/02/2026, 15:30
We study the D\bar{D}^, DD^, and B\bar{B}^* correlation functions and discuss the structure of the associated exotic hadrons.
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Koichi Murase (RCNP, the University of Osaka)20/02/2026, 16:10
Recently, femtoscopy has gathered attention as a new approach to
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access hadron--hadron interactions through momentum correlation functions. In particular, the $s$-wave interaction has been extensively discussed in the field. In this talk, we discuss the effect of interactions in higher partial waves on the femtoscopic correlation function. We first attempt to extend existing $s$-wave... -
20/02/2026, 16:50
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Prof. Shigehiro Yasui (Nishogakusha Univ.)21/02/2026, 09:00
It has been discussed for a long time that light flavors, i.e., up, down and strangeness, give a variety of exotic hadrons. One of the most important examples are scalar mesons and glueballs. In this talk, we discuss these better-known light exotic particles from new perspectives. Firstly, we discuss a new framework for inner-structures of scalar mesons, and propose to study them by...
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Parikshit Junnarkar (RCNP, Osaka)21/02/2026, 09:40
I will show some preliminary results on doubly bottom tetra quark states.
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Etsuko Itou (iTHEMS, RIKEN)21/02/2026, 10:50
In the vacuum of ordinary QCD, the lightest hadron is the pion, which is an isotriplet pseudoscalar meson. This can be shown using QCD inequalities, if we assume that the theory possesses gamma_5 Hermiticity and that disconnected diagrams do not contribute. However, in the finite-density regime, gamma_5 Hermiticity is lost, and this argument no longer holds. In contrast, in two-color QCD, an...
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Takumi DOI (RIKEN)21/02/2026, 11:30
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