CP-violating dipole form factors of the top quark and tau lepton in scalarleptoquark models

We calculate the CP-violating electric and weak dipole form factors of the top quark and the tau lepton in models with scalar leptoquarks coupling onl y to the third generation of quarks and leptons. We obtain numerical values of the real and imaginary parts of these form factors at various energies for different values of leptoquark masses and couplings. The existing limit s on the tau electric and weak dipole form factors allow us to put a limit on the masses and couplings of such leptoquarks and therefore on the top el ectric and weak dipole form factors. We also discuss constraints on the for m factors coming from indirect limits on leptoquark masses and couplings de duced from LEP results on Z properties.