Quartet S wave neutron deuteron scattering in effective field theory Original Research Article

The real and imaginary part of the quartet S wave phase shift in nd scattering (4S3/2) for centre-of-mass momenta of up to View the MathML source) 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.