Perturbative chiral nucleon–nucleon potential for the 3P0 partial wave

Abstract

We study perturbativeness of chiral nuclear forces in the 3P0 channel. In previous works, the focus has been on the one-pion exchange, and the applicable window of perturbative pion exchanges has been shown to span from the threshold to center-of-mass momentum k ≃ 180 MeV. We will examine, instead, whether the cancellation of short- and long-range parts can sufficiently soften the 3P0 chiral force to make it more amenable to perturbation theory. The result is encouraging, as the combined 3P0 force is shown to be perturbative up to k ≃ 280 MeV, covering many nuclear-structure calculations.