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Predict" the rate for the decay $\tau^{-} \rightarrow \mathrm{e}^{-} \bar{\nu}_e \nu_\tau$, where the $\tau$-lepton has mass $1.8 \mathrm{GeV}$. The observed branching ratio of this decay mode is approximately $20 \%$. Calculate the lifetime of the $\tau$-lepton. Can you explain this branching ratio?

   Predict" the rate for the decay $\tau^{-} \rightarrow \mathrm{e}^{-} \bar{\nu}_e \nu_\tau$, where the $\tau$-lepton has mass $1.8 \mathrm{GeV}$. The observed branching ratio of this decay mode is approximately $20 \%$. Calculate the lifetime of the $\tau$-lepton. Can you explain this branching ratio?

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Quarks and leptons: introductory course in modern particle physics

Quarks and leptons: introductory course in modern particle physics

Francis Halzen, Alan… 1st Edition

Chapter 12, Problem 12

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This process is mediated by the weak interaction, specifically through the exchange of a $W$ boson. Show more…

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Predict" the rate for the decay $\tau^{-} \rightarrow \mathrm{e}^{-} \bar{\nu}_e \nu_\tau$, where the $\tau$-lepton has mass $1.8 \mathrm{GeV}$. The observed branching ratio of this decay mode is approximately $20 \%$. Calculate the lifetime of the $\tau$-lepton. Can you explain this branching ratio?

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