MAJORANA NEUTRINO VERSUS DIRAC NEUTRINO IN E(-)-]W+W- THROUGH RADIATIVE-CORRECTIONS()E()

Radiative corrections to e(+)e(-) --> W+W- from Majorana neutrinos are studied in the context of the see-saw mechanism. Focusing on the effe cts of the fourth generation neutrinos, we calculate W-pair form facto rs, the differential cross sections and the forward-backward asymmetri es for the polarized electrons at one-loop level. The behaviour of the form factors at the threshold of Majorana particle pair production is found to differ from that of Dirac particle pair production. In the c ross section for unpolarized electrons, the radiative corrections, dep ending on the mass parameters of the see-saw mechanism, are found to b e similar to 0.5% at the energy range of the LEP200 and the next gener ation linear colliders.