Probing nucleon-Ωccc interaction via lattice QCD at physical quark masses

We study the S-wave interactions between the nucleon ( N ) and the triply charmed Omega baryon (Ω ccc ) using (2+1)-flavor lattice QCD with a physical pion mass ( m π ≃ 137.1 MeV) on a lattice volume ≃ (8.1 fm) 3 . The charm quark is implemented with a relativistic heavy-quark action at its physical mass. Employing the time-dependent HAL QCD method, the N − Ω ccc potentials in the spin-1 ( 3 S 1 ) and spin-2 ( 5 S 2 ) channels are extracted. In both channels, overall attraction is found with the scattering parameters, a 0 = 0.56 ( 0.13 ) ( − 0.03 + 0.26 ) fm and r eff = 1.60 ( 0.05 ) ( − 0.12 + 0.04 ) fm for the 3 S 1 channel, and a 0 = 0.38 ( 0.12 ) ( − 0.00 + 0.25 ) fm and r eff = 2.04 ( 0.10 ) ( − 0.22 + 0.03 ) fm for the 5 S 2 channel, indicating the absence of a dibaryon bound state. The extracted potentials are further decomposed into spin-independent and spin-dependent components. The spin-independent potential is a dominant component and features a short-range attractive core and a long-range attractive tail, while the spin-dependent potential shows short-range attraction (repulsion) in the spin-1 (spin-2) channel. Qualitative comparisons with previous studies of the N − J / ψ and N − Ω sss systems at m π ≃ 146 MeV are provided, emphasizing the role of heavy-hadron chromo-polarizability arising from soft-gluon exchange between the nucleon and flavor-singlet hadrons. The charm quark mass dependence of the N − Ω c c c potential is investigated as well.