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

We study hadron-hadron interactions in (2+1)-flavor lattice QCD near the physical pion mass ($m_π\simeq 146\mathrm{MeV}$) using the HAL QCD method, with particular emphasis on two-pion exchange (TPE). The nucleon--flavor-singlet hadron potentials such as $ϕ$-$N$, $J/ψ$-$N$, and $η_c$-$N$ are found t