Helicity effects in neutral heavy lepton decays

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Abstract
The search for the existence of neutral heavy leptons may provide valuable information regarding plausible extensions to the standard model. In order to accurately study the decay of neutral heavy leptons, it is essential to include the helicity effects which arise from their non-zero mass. In this paper, we specifically examine the effects of helicity on the leptonic and semi-leptonic decays of neutral heavy leptons.