Production of qqQQ final states in ee collisions in the left-right symmetric model

We consider the reaction e − e − → qq ¯ q ¯ q as a test of lepton number non-conservation in the framework of the left-right-symmetric electroweak model. The main contributions to this process are due to Majorana neutrino exchange in t -channel and doubly charged Higgs (∆ −− ) exchange in s -channel with a pair of right-handed weak bosons ( W R ) as intermediate state. We show that in a linear e − e − collider with the collision energy of 1 TeV (1.5 TeV) the cross section of this process is 0.01 fb (1 fb), and it will, for the anticipated luminosity of 10 35 cm − 2 , be detectable below the W R threshold. We study the sensitivity of the reaction on the masses of the heavy neutrino, W R and ∆ −− .