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We study the possibility of future $e^{+}e^{-}$ colliders to disentangledifferent new physics contributions to the production of heavy sterile Majorananeutrinos in the lepton number violating channel $e^{+}e^{-}\rightarrow l^{+}l^{+}+ 4 jets$, with $l=e, \mu, \tau$. This is done investigating the finalanti-tau polarization trails and initial beam polarization dependence of thesignal on effective operators with distinct Dirac-Lorentz structurecontributing to the Majorana neutrino production and decay, which parameterizenew physics from a higher energy scale. We find both analyses could welldisentangle possible vectorial and scalar operators contributions.

Final taus and initial state polarization signatures from effective interactions of Majorana neutrinos at future $e^{+}e^{-}$ colliders