[tex]e^+ e^- \rightarrow \mu^+ \mu^-[/tex](adsbygoogle = window.adsbygoogle || []).push({});

The reaction above can take place in two different ways:

1) The electromagnetic interaction by exchanging a [tex]\gamma[/tex]

2) The weak interaction by exchanging a [tex]Z^0[/tex]

Can somebody explain which way is more probable and why.

I'm not sure but I guess that the first way is more probable because the photon has zero mass and the [tex]Z^0[/tex] is a rather heavy particle. Is that always true or are there any exceptions?

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# Weak interaction

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