Question: Consider the decays + e + + v e + and + e + + v e + v

Consider the decays μ+ → e+ + ve + ν̅μ and τ+ → e+ + ve +  ̅vτ . The branching ratios are 100% for the first, 16% for the second. The μ lifetime is τμ = 2.2 μs. Calculate the ττ lifetime.

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