Impacts of the CP-odd phase of the chargino mass matrix in light chargino-pair production at LEP II

One CP-odd rephase-invariant phase appears in the chargino mass matrix in the Minimal Supersymmetric Standard Model. We investigate in detail the phenomenological impacts of the CP-noninvariant phase in the pair production of light charginos in e+e− annihilation. The values of the chargino masses and the mixing angles, determining the size of the wino and higgsino components in the chargino wave functions, are so sensitive to the phase that the constraints on the supersymmetry parameters based on the conventional assumptions for the parameters are recommended to be re-evaluated including the CP-noninvariant phase.