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## Main Question or Discussion Point

If given the cross section for ZZ* to two leptons, is it possible to work out the cross section for ZZ* to just electrons or muons from it? So excluding the tau decay mode, unless ##ZZ^{*} \rightarrow \tau + \tau## can't happen anyway? I'm guessing it wouldn't just be two thirds of the ##ZZ \rightarrow ll## cross section, because of the different masses and probably various other factors. Do you just have to go and experimentally measure the cross section?

Apologies for the poor phrasing. I'm having trouble expressing what my question actually is, but mainly I don't understand how cross sections work. Especially if the cross section for Z to electron or muon actually is two thirds the cross section for Z to leptons. And actually ##\frac{2}{3}## wouldn't include the neutrinos so maybe I mean ##\frac{2}{6}##.

Apologies for the poor phrasing. I'm having trouble expressing what my question actually is, but mainly I don't understand how cross sections work. Especially if the cross section for Z to electron or muon actually is two thirds the cross section for Z to leptons. And actually ##\frac{2}{3}## wouldn't include the neutrinos so maybe I mean ##\frac{2}{6}##.