Testing lepton number violation with the reaction e−e−→μ ν q q̄

We investigate the reaction e−e−→μ ν q q̄ as a possible place to test the lepton number violating interactions of singly charged scalars ΔL± belonging to a SU(2)L triplet. The existence of such scalars is predicted by some majoron models, as well as by the left-right symmetric extension of the Standard Model. We show that this reaction may be observed in e−e− collision well below the threshold of ΔL±. For the colliding energy s=500 GeV the mass of the singly charged Higgs triplet may be excluded up to 2 TeV and even more, depending on values of the appropriate Yukawa couplings.