I was studying my notes and specifically for the ##e^+e^- \rightarrow \mu^+ \mu^-## process, cross section is given by(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\sigma = \frac{4\pi}{3} \left( \frac{\alpha \hbar c}{W} \right)^2 [/tex]

where ##\alpha = \frac{g_{EM}^2}{4\pi}## and ##W## is the centre of mass energy.

Is this the same for ##e^+e^- \rightarrow \tau^+ \tau^-## and ##e^-e^+ \rightarrow e^-e^+## process? I know the vertex factor is the same as they have the same charge.

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# Cross Section for e+e- in EM interaction - Is it the same?

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