CP-violating asymmetry in chargino decay into neutralino and W boson

In the MSSM with complex parameters, loop corrections to χ˜i±→χ˜j0W± lead to a CP violating asymmetry ACP=(Γ(χ˜i+→χ˜j0W+)−Γ(χ˜i−→χ˜j0W−))/(Γ(χ˜i+→χ˜j0W+)+Γ(χ˜i−→χ˜j0W−)). We calculate this asymmetry at full one-loop level. We perform a detailed numerical analysis for χ˜1±→χ˜10W± and χ˜2±→χ˜10W± analyzing the dependence on the parameters and phases involved. Asymmetries of several percent are obtained. We also discuss the feasibility of measuring these asymmetries at LHC.