Quartet S wave neutron deuteron scattering in effective field theory

Abstract

The real and imaginary part of the quartet S wave phase shift in nd scattering ( 4S 3/2) for centre-of-mass momenta of up to 300 MeV(E cm ≈70 MeV ) is presented in effective field theory, using both perturbative pions and a theory in which pions are integrated out. As available, the calculation agrees with both experimental data and potential model calculations, but extends to a higher, so far untested momentum régime above the deuteron breakup point. A Lagrangean more feasible for numerical computations is derived.