= Neutrino
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A neutrino is an electrically neutral spin-one-half <lepton> with very weak ordinary interactions. The three active flavors are associated with the electron, muon and tau in <weak charged current> production and detection. A flavor state is generally a superposition of <neutrino mass> eigenstates, permitting <neutrino oscillations> during propagation.
Detection infers a neutrino from its interaction products rather than observing an ionizing track from a free neutrino. A charged-current event can produce the corresponding charged lepton, while a neutral-current event leaves a neutrino in the final state and deposits energy in the target. Small interaction probabilities motivate large target masses and careful control of backgrounds. Neutrality does not imply zero mass; oscillations constrain differences of squared masses, rather than fixing the absolute mass scale by themselves.
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