Perturbative calculations of light nuclei up to N3LO in chiral effective field theory
Abstract
We predict ground-state energies of 3H, 4He, and 6Li in chiral effective field theory up to next-to-next-to-next-to-leading-order (N3LO) using a power counting guided by renormalization-group invariance. Subleading two-nucleon interactions are treated perturbatively, and for 4He and 6Li, we calculate the perturbative corrections from numerical derivatives of ground-state energies obtained with Lanczos diagonalization. We find that including the 3H binding energy in the calibration is essential for robust predictions of 4He and 6Li. This work demonstrates that the employed power counting can be applied to construct nuclear interactions with predictive power for light nuclei, bringing nuclear structure predictions closer to a foundation in quantum chromodynamics.
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