Few-Nucleon Systems within Finite-Cutoff Pionless EFT
arXiv:2509.11180 · doi:10.1016/j.physletb.2025.140100
Abstract
We investigate pionless effective field theory (\nopieft) with finite-cutoff regularization as a framework for describing few-nucleon systems. This formulation incorporates effective-range effects already at leading order (LO), thereby reaching next-to-leading-order (NLO) accuracy while maintaining computational efficiency. Using correlated-Gaussian stochastic variational methods in a weak harmonic-oscillator trap, together with neutral and Coulomb-modified quantization conditions, we calculate binding energies and low-energy -wave scattering parameters for systems with up to five nucleons. At an optimal cutoff, the computed binding energies of the deuteron, triton, helion, and alpha particle reproduce experimental values at the percent level once a three-body force is included. Scattering parameters for proton--proton, nucleon--deuteron, nucleon--triton, proton--helion, deuteron--deuteron, and nucleon--alpha channels are obtained and found to be consistent with both experimental data and existing NLO \nopieft\ calculations. These results demonstrate that finite-cutoff \nopieft\ offers a robust and predictive framework for few-body nuclear physics.
References in corpus (10)
- Updated analysis of NN elastic scattering to 3 GeV
- Proton-He elastic scattering at low energies
- Elastic proton scattering on tritium below the n- threshold
- Effective Field Theory for Few-Boson Systems
- The proton-deuteron system in pionless EFT revisited
- A Consistency Test of EFT Power Countings from Residual Cutoff Dependence
- Five-body calculation of -wave -He scattering at next-to-leading order pionless effective field theory
- A Precision Measurement of the Neutron Scattering Length of He-4 Using Neutron Interferometry
- Few nucleons scattering in pionless effective field theory
- Subleading contributions to -boson systems inside the universal window