Abstract
We compare the standard finite volume method by Lüscher with the potential method by HAL QCD collaboration, by calculating the ground state energy of N(nucleon)-Ω(Omega) system in 5 S2 channel. We employ 2+1 flavor full QCD configurations on a (1.9 fm )3×3.8 fm lattice at the lattice spacing a≃0.12 fm , whose ud(s) quark mass corresponds to mπ = 875(1) (mK = 916(1)) MeV . We have found that both methods give reasonably consistent results that there is one NΩ bound state at this parameter.
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