Paralepton hypothesis

Other possibilities that have been considered in the literature are that T could be a new lepton with (i) the quantum numbers of either the electron or the muon (this has occasionally been referred to as the ortholepton hypothesis)—in this case the r neutrino, i>r would be identical with either i/g or (ii) with the quantum numbers of one of the light antileptons (the paralepton hypothesis)—in this case would be identical with either z7g or i. All these hjq>otheses have by now been dismissed on experimental grounds. 

As was mentioned earlier, this rules out the paralepton hypothesis and makes it unlikely that the r is not a sequential lepton. 

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See also in sourсe #XX -- [ ]

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