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We show that the longitudinal beam polarization option at a futureelectron-positron collider provides an unambiguous distinction betweenlow-scale seesaw models of neutrino mass. This is possible due to the fact thatthe pair production cross section of the heavy neutrinos in seesaw models issensitive to the polarization of the initial lepton beams, and for a suitablechoice of the polarization, shows a clear enhancement over the unpolarizedcross section. More interestingly, the choice of the beam polarization forwhich the enhancement is maximum is governed by the size of the light-heavyneutrino mixing parameter. We also find that using this effect, one can probe apreviously uncharted parameter space of the left-right seesaw model, which iscomplementary to the existing searches at both energy and intensity frontiers.

Probing Left-Right Seesaw using Beam Polarization at an $e^+e^-$ Collider