Elastic P-wave phaseshifts in positron-hydrogen-atom collisions using the Schwinger principle

Very accurate results for the elastic P-wave phaseshifts below the positronium formation threshold in positron-hydrogen atom collisions are obtained using only four terms in a discrete basis set expansion in the Schwinger variational principle. Stationary results are also presented for higher partial waves up to l=6 for the scattering of electrons and positrons from the static potential in the incident momentum range 0.1-1.0 au.