Theoretical values for the branching ratios of the W particle:

Leptonic decays

Branching ratio
Total 32,2 %
electron + electron-neutrino 10,7 %
muon + myon-neutrino 10,7 %
tau + tau-neutrino 10,7 %

 

Quark decays

Branching ratio
Total 67,8 %