The differential cross sections for e^(-)-Ar and e^(+)-Ar elastic scattering are calculated by relativistic partial wave expansion method.In the processes an incident particle(electron or positron)is treated as moving relativistically in an effective central potential.For electron-atom scattering,the effective potential is calculated by relativistic self-consistent-field(SCF)method with the Slater local exchange approximation.For the positron scattering,the effective potential is the electrostatic potential determined by the ground-state electron charge density calculated by the SCF method.For atomic target polarization due to the incident charge particle(e1ectron or pwitron),the effect is treated approximately by adding a static polarization potential to the SCF potentials.The calculated results show that the polarization effect is very important for the low energy positron-atom scattering.
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