Explicit Renormalization of Nuclear Chiral EFT and Nonperturbative Effects

Abstract

AbstractNucleon-nucleon interaction is studied within chiral effective field theory at next-to-leading order in the chiral expansion. The leading order interaction is resummed nonperturbatively, whereas the next-to-leading-order terms are taken into account in a perturbative manner. Explicit renormalizability of such a scheme is analyzed in several important cases. The possibility to absorb the power-counting breaking terms originating from the integration regions with large momenta is studied for both perturbative and nonperturbative regimes. A comparison of the schemes with a finite and an infinite cutoff is performed.