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

In the MSSM with complex parameters, loop corrections to chi(i)(+/-) -> chi(j)(0)W(+/-) lead to a CP violating asymmetry A(CP) = (Gamma(chi(i)(+) -> chi(j)(0)W(+)) - Gamma(chi(i)(-) -> chi(j)(0)W(-)))/(Gamma(chi(i)(+) -> chi(j)(0)W(+)) + Gamma(chi(i)(-) -> chi(j)(0)W(-))). We calculate this asymmetry at full one-loop level. We perform a detailed numerical analysis for chi(1)(+/-) -> chi(1)(0)W(+/-) and chi(2)(+/-) -> chi(1)(0)W(+/-) 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. (c) 2005 Elsevier B.V. All rights reserved.