Nucleon-nucleon scattering up to next-to-leading order in manifestly Lorentz-invariant chiral effective field theory: low phases and the deuteron

TL;DR

This paper investigates nucleon-nucleon scattering using Lorentz-invariant chiral effective field theory at next-to-leading order, achieving reasonable phase shift descriptions and deuteron properties, supporting future many-body applications.

Contribution

It demonstrates a non-perturbative treatment of the potential at NLO in Lorentz-invariant chiral EFT for low partial waves, showing promising results.

Findings

Reasonable description of S and P wave phase shifts.

Accurate deuteron properties obtained.

Feasibility of applying formalism to many-body systems.

Abstract

Recently the nucleon-nucleon interaction derived using time-ordered perturbation theory in manifestly Lorentz-invariant chiral effective field theory was shown to yield promising results for peripheral neutron-proton scattering. In this work we study low partial waves at next-to-leading order by treating the potential non-perturbatively in the scattering equation. Reasonable description of the phase shifts in the $S$ and $P$ waves as well as the deuteron properties is observed, which can be regarded as a feasibility study for the application of our formalism to the few- and many-body calculations.