CP violation at one loop in the polarization-independent chargino production in e + e - collisions

Recently Osland and Vereshagin noticed, based on sample calculations of some box diagrams, that in unpolarized e{sup +}e{sup -} collisions CP-odd effects in the nondiagonal chargino-pair production process are generated at one loop. Here we perform a full one-loop analysis of these effects and point out that in some cases the neglected vertex and self-energy contributions may play a dominant role. We also show that CP asymmetries in chargino production are sensitive not only to the phase of {mu} parameter in the chargino sector but also to the phase of stop trilinear coupling A{sub t}.