HEAVY NEUTRINO MIXING AND SINGLE PRODUCTION AT LINEAR COLLIDER

We study the single production of heavy neutrinos via the processes e( -)e(+) --> nu N and e(-)gamma --> W-N at future linear colliders, As a base of our considerations we take a wide class of models, both with vanishing and non-vanishing left-handed Majorana neutrino mass matrix m(L). We perform a model independent analyses of the existing experime ntal data and find connections between the characteristic of heavy neu trinos (masses, mixings, CP eigenvalues) and the m(L) parameters, We s how that with the present experimental constraints heavy neutrino mass es almost up to the collision energy can be tested in the future exper iments. (C) 1997 Published by Elsevier Science B.V.