△-full chiral effective field theory in finite harmonic oscillator basis

We regulate △-full chiral effective field theory (EFT) potentials upto next-to-next-to-leading order by using finite harmonic oscillator basis as the regulator. We extend the method, previously developed for pionless effective field theory, to include additional pion-exchange terms between two- and three-nucleons in chiral EFT. This approach ensures ultra-violet (UV) convergence by construction without the need of starting from a big enough oscillator model space to capture the tail of conventionally employed momentum space regulators.  The low-energy coefficients of the short-range nucleon-nucleon (NN) and three-nucleon EFT interactions are adjusted to reproduce the low-energy NN phase shifts and triton ground state properties, respectively. We compute the ground state energies and radii of ³H, ³He and ⁴He nuclei as proof-of-principle calculations for this framework.