A nonlocal RG ansatz with one-loop self-consistent equations yields approximate fixed-point values Δ_φ ≈ 0.81479 and Δ_φ² ≈ 1.37042 for the 3D Wilson-Fisher fixed point at ε=0.5.
This leading contribution is encapsulated by the 3-loop skeleton topologies (the box-type and overlapping trian- gle channels) computed in Eq
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