Heavy neutrinos in e(+)e(-) collisions

Detailed production and decay properties of a heavy neutrino, N, are investigated in view of the coming high energy electron-positron machines as e.g., LEP200. Concentrating on two heavy neutrino production processes, the N(N bar) pairproduction and the N(nu bar) channel, both the Dirac and Majorana neutrino cases are studied and left and right handed heavy neutrino couplings are compared. The correlated production of two same signed leptons of the same flavor is discussed. Such a pair appears in approximately half of the decays of the NN system if N is a Majorana particle. Studying these correlations will offer a promising method to experimentally distinguish between heavy Dirac and Majorana neutrinos.