Analyzing your results

Di-lepton measurement

  1. Compare the histograms of the electron-positron and muon-antimuon pairs.
    • Can you point out differences/similarities?
    • How often does the Z boson decay into electron-positron pairs? How often does the decay result in muon-antimuon pairs?
    • What did you expect? Why?
    • Do you notice any other particles? At which invariant masses?
  2. What is the most probable mass of the Z boson?
    • Why is there not one exact value for the Z boson mass?
    • What could be the possible explanations of why the distribution is so wide?
  3. Have you discovered the Z' boson?
    • If you think so, what is the Z' boson's mass?
  4. Why is it useful to combine your results with those obtained by other groups?

Di-photon measurement

  1. Do you see any sign of Higgs decaying to 2 photons, H→γγ?
    • If no, what could be the reasons?
    • In fact the full sample does contain some real Higgs candidates, even if you you have not found them!

4-lepton measurement

  1. Do you see any sign of Higgs decaying to 4 leptons, H→ZZ→llll?
    • If no, what could be the reasons?
    • In fact the whole sample contains one Higgs candidate. At which mass?