Several attractive theories predict the existence of mirror fermions. There is a good theoretical reason to expect that the lightest mirror fermions might have relatively long lifetimes. We explore the experimental consequences of such a possibility, focusing on mirror lepton production at the SLC near the Z0 resonance. We find that by going slightly off resonance or by polarizing the electron beam one can clearly distinguish the mirror leptons from ordinary leptons.
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Banks et al. (1987) studied this question.