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## how do you distinguish between neutrinos of different types?

since we don't know its mass,, is it by looking at the lepton by products?
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 is it by looking at the lepton by products?
Exactly.

When measuring a $\nu$, we don't have the sensitivity required to idendify the mass eigenstate.

we measure the flavor, by identifying the flavor of the lepton produced.

See for example opera's measurement of tau neutrinos in a muon neutrino dominated beam

by identifying the tau decay http://arxiv.org/pdf/1006.1623v1.pdf

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