Two-Pion Exchange Paradigm in Hadron-Hadron Interactions from Lattice QCD

Abstract

We study hadron-hadron interactions in (2+1)-flavor lattice QCD near the physical pion mass ($m_{\pi }\simeq 146\mathrm{MeV}$) using the HAL QCD method, with particular emphasis on two-pion exchange (TPE). The nucleon--flavor-singlet hadron potentials such as $\varphi$-$N$, $J/\psi$-$N$, and ${\eta }_c$-$N$ are found to be attractive at all distances. Moreover, in the long-range region where one-pion exchange is forbidden, we observe lattice signatures consistent with TPE dominance. These results demonstrate that the HAL QCD method can extract universal long-distance phenomena, such as TPE, directly from nonperturbative QCD dynamics.

arXiv comment6 pages, 5 figures. Talk at Baryons 2025 (Jeju Island, Korea, Nov.10-14, 2025)

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