0 Electroweak Sudakov at two loop level

We investigate the Sudakov double logarithmic corrections to the form factor of fermion in the SU(2)⊗U(1) electroweak theory. We adopt the familiar Feynman gauge and present explicit calculations at the two loop level. We show that the leading logarithmic corrections coming from the infrared sin-gularities are consistent with the " postulated " exponentiated electroweak Sudakov form factor. The similarities and differences in the " soft " physics between the electroweak theory and the unbroken non-abelian gauge theory (QCD) will be clarified.