Things to investigate

[lawrenceleejr]

• Maybe output a small ttree that just has the information about our jets in it so we can friend it with the input tree later and draw plots on the fly
• Play with photon definition. Maybe call something a photon if the highest energy particle in the jet is a photon. Or if photon is more than half the energy of the whole "jet", etc etc.
• ISR cut
• Jet system (not including any photons) has an invariant mass much larger than the Z mass

[lawrenceleejr]

Maybe try a cut on the invariant mass of the trijet system. Let's define trijets as events with mjjj>110 GeV as informed by

[lawrenceleejr]

Also be careful about the jet definition and counting. Maybe actually fill up lists of jet objects like "photons" and "hadronicjets" and then just ask for the length of these things.

[lawrenceleejr]

Deal with any potential isolated leptons. Maybe see how many "jets" are dominated by a single lepton, using pwflag

From Anthony:

- the 0 pwflag (via Marcello Maggi from ALEPH) - CHARGED_TRACK, CHARGED_LEPTONS1, CHARGED_LEPTONS2, V0, PHOTON, NEUTRAL_HADRON
   - need to remind myself what LEPTONS1 vs LEPTONS2 means

[jslawless]

@lawrenceleejr Yesterday we saw a big difference in the number of events in the trijet n90 plot. I think that was because of the change of the requirement ">=3 non photon clusters" to ">=3 non photon clusters with E>10 GeV"