CPviolation ine+e−→tt¯:Energy asymmetries and optimal observables ofbandb¯quarks

The energy spectra of the b andb quarks in e + e − → twith t → bW (¯ → ¯) are calculated assuming CP violation in the production process. Expressions for the corresponding CP violating asymmetries and optimal ob- servables that determine the imaginary parts of the electric and weak dipole moment form factors of the top quark are derived. It is shown that polar- ization of the initial lepton beams is essential to disentangle ℑm d(s) and ℑm d Z (s). Numerical results are given in the Minimal Supersymmetric Stan- dard Model with complex phases.