Significance of chiral three-nucleon force contact terms for understanding of elastic nucleon-deuteron scattering
Abstract
We investigate the importance of the three-nucleon (3N) force contact terms in elastic nucleon-deuteron (Nd) scattering by applying the N4LO+ chiral semi-local momentum space (SMS) regularized nucleon-nucleon (NN) chiral potential supplemented by N2LO and all subleading N4LO three-nucleon force (3NF) contact terms. Strength parameters of the contact terms were obtained by least squares fitting of theoretical predictions to cross section and analyzing powers data at three energies of the impinging nucleon. Although the N3LO contributions to the 3N force were completely neglected, the results calculated with the contact terms multiplied by the fitted strength parameters yield an improved description of the elastic Nd scattering observables in a wide range of incoming nucleon energies below the pion production threshold.
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