Volume 518 - The 42nd International Symposium on Lattice Field Theory (LATTICE2025) - Parallel Session Hadronic and nuclear spectrum and interactions
Quark mass dependence of the nuclear LS force
T. Sugiura
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Abstract
We study the quark-mass dependence of the nuclear spin-orbit (LS) force in lattice QCD using the HAL QCD method with the free Laplacian Heaviside (fLapH) source operator. From flavor-SU(3) symmetric gauge ensembles at $m_{\mathrm{PS}} \simeq 837$, $672$, and $469\,\mathrm{MeV}$, we extract the central, tensor, and LS forces in the $(S,I)=(1,1)$ sector.
The central force is found to be repulsive and the LS force attractive, with both becoming stronger toward lighter quark masses.
These contributions largely cancel in the $^3P_2$ channel, resulting in a repulsive potential with only mild quark-mass dependence.
These results do not support the emergence of $^{3}P_{2}$ neutron superfluidity at the quark masses considered here.
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