The parity-violating asymmetry in the ³He(→n, p) ³H reaction

The longitudinal asymmetry A^n3He_z in the ³He(→n, p)³H reaction is an observable directly related to parity-violating (PV) components in the nucleonnucleon (NN) interaction. Here we study A^n3He_z using a PV NN potential derived from an effective field theory framework at next-to-next-to-leading order, including one- and two-pion exchanges, contact interactions and relativistic corrections. This potential depends on six low-energy constants. Some of these parameters are constrained to reproduce the existing accurate measurements of the →p-p longitudinal asymmetry. Using these constraints we compute A^n3He_z and study the sensitivity of such an observable to the unconstrained parameters.