Chiral EFT for two-nucleon forces:
New developments
New developments
Sven Heihoff
(Ruhr University-Bochum)
(Ruhr University-Bochum)
Estimating theoretical uncertainties of chiral EFT calculations is crucial for meaningful
comparisons with experimental data. A key source of uncertainty arises from truncating the EFT
expansion, where higher-order terms have to be neglected. Traditional methods estimate
truncation uncertainty by analyzing lower-order convergence patterns, assuming a direct
translation of the expansion scheme of the nuclear Hamiltonian to observables—an assumption that
may not hold for fine-tuned systems. I present an alternative approach to quantify contributions
from next-higher-order terms by explicitly marginalizing over their parameters and compare the
results with those based on the conventional method.
Another topic to be addressed concerns the short-range part of the two-nucleon potential at fourth expansion order (i.e., N3LO), which only affects its off-shell behaviour. I will discuss the possibility to constrain the corresponding parameters from three-nucleon scattering data.
Another topic to be addressed concerns the short-range part of the two-nucleon potential at fourth expansion order (i.e., N3LO), which only affects its off-shell behaviour. I will discuss the possibility to constrain the corresponding parameters from three-nucleon scattering data.