Question: Three leptons e , , may be assumed to have same weak coupling constant. The lepton ( mass 1 7 4 8 MeV / c

Three leptons e,, may be assumed to have same weak coupling constant. The lepton (mass 1748 MeV/c2) and muon (mass 105 MeV/c2) have decay modes and branching ratios as follows e ++(100%) e ++(17%)1Given that the mean life time of the is 2.2\times 106s, make an estimate of the mean life time of tau lepton?

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