Heavy neutrino mixing and single production at Linear Collider

Abstract

We study the single production of heavy neutrinos via the processes $e^{-}{e}^{+}\to \hat{I}½N$ and $e^{-}{\hat{I}}^3\to W^{-}N$ 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 experimental data and find connections between the characteristic of heavy neutrinos (masses, mixings, CP eigenvalues) and the $m_L$ parameters. We show that with the present experimental constraints heavy neutrino masses almost up to the collision energy can be tested in the future experiments.

latex, 14 pages, 4 ps files