I read in a thesis (no online link provided) that tau-jets result in a narrower cone in comparison with the other quark/gluon originated jets. I don't understand this. Is this true? If so, why?
The tau decay hadronically thorugh neutrino + Wboson (greater Branching ration). And then the W boson decay in one charged hadron (narrow jets).
In QCD things are a little different, gluons/quarks for example doesn't have neutrino on his decays and then multiplicity on final state is larger, more hadrons produced (wider jets).
And gluons can produce more jets than light quark jets (higher multiplicity), gluons jets are wider than quarks jets.