Is it possible for a tau lepton (whose mass is almost twice that of a proton) to decay into only hadrons? (a) Yes, because it is so massive it could decay into a proton and pions. (b) Yes, it could decay into pions and nothing else. (c) No, such a decay would violate lepton number; all of its decay products must be leptons. (d) No, its decay products must include a tau neutrino but could include hadrons such as pions. (e) No, the tau lepton is too massive to decay.
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