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It is argued that the fine-tuning due to the unnaturally large, generalizedeffective range in the 1S0 channel of NN scattering must be incorporated inorder for one to obtain satisfactory convergence for chiral effective fieldtheory. Without the proposition of perturbative one-pion exchange, an effectivefield theory with the spin-0, isospin-1 dibaryon is developed to account forthis fine-tuning, and is demonstrated up to O(Q) where the leading irreducibletwo-pion exchange arises. The approach shown in the paper results in rapidconvergence of the 1S0 partial-wave amplitude.

Improved convergence of chiral effective field theory for 1S0 of NN scattering