A unitary transformation allows to remove redundant terms in the two-nucleon (2𝑁) contact interaction at the fourth order (N3LO) in the low-energy expansion of chiral effective field theory. In so doing a three-nucleon (3𝑁) interaction is generated. We express its short-range component in terms of five combinations of low-energy constants (LECs) parametrizing the N3LO 2𝑁 contact Lagrangian. Within a hybrid approach, in which this interaction is considered in conjunction with the phenomenological AV18 2𝑁 potential, we show that the involved LECs can be used to fit very accurate data on polarization observables of low-energy 𝑝−𝑑 scattering, in particular the 𝐴𝑦 asymmetry. The resulting interaction is of the right order of magnitude for a N3LO contribution.
Effect of the N3LO three-nucleon contact interaction on p−d scattering observables
E. Filandri;
2023-01-01
Abstract
A unitary transformation allows to remove redundant terms in the two-nucleon (2𝑁) contact interaction at the fourth order (N3LO) in the low-energy expansion of chiral effective field theory. In so doing a three-nucleon (3𝑁) interaction is generated. We express its short-range component in terms of five combinations of low-energy constants (LECs) parametrizing the N3LO 2𝑁 contact Lagrangian. Within a hybrid approach, in which this interaction is considered in conjunction with the phenomenological AV18 2𝑁 potential, we show that the involved LECs can be used to fit very accurate data on polarization observables of low-energy 𝑝−𝑑 scattering, in particular the 𝐴𝑦 asymmetry. The resulting interaction is of the right order of magnitude for a N3LO contribution.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
