Work

Perturbative χ EFT calculations of the deuteron and triton up to N 2 LO

Year: 2025

Type: article

Abstract: We extend previous studies of the deuteron and triton ground-state energies to next-to-next-to-leading order ( N 2 LO ) in chiral effective field theory, employing a power counting in which subleading interactions are treated perturbatively. Triton calculations are performed using the no-core shell model, and we demonstrate converged perturbative results for regulator cutoffs up to Λ ≈ 1200 MeV. We analyze exceptional cutoffs in the 3 P 0 and 3 S 1 – 3 D 1 nucleon-nucleon channels and find a resulting cutoff dependence in the triton ground-state energy at N 2 LO . The effect associated with the exceptional cutoff in the 3 P 0 channel can be mitigated by redefining the leading-order wave function within the freedom allowed by the effective field theory. The same approach applied in the 3 S 1 – 3 D 1 channel remedies the effect of this exceptional cutoff on the ground state energy of the deuteron, but not for the triton.

Source: Physical Review C

DOI: 10.1103/tjld-x141

Authors: Oliver Thim, Andreas Ekström, Christian Forssén

Institution: Chalmers University of Technology

Language: English

Topic: Nuclear physics research studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funder: Vetenskapsrådet

Awards: Precision Nuclear Theory, Ab initio emulation of atomic nuclei: Bayesian inference for unraveling the complexities of the strong nuclear interaction, The strong nuclear interaction: governing the quantum properties of nuclei and the neutron-star equation of state