Implement rest of the analysis cuts

[x] Trigger pass
[x] primary vertex with z<24 cm
[x] dxy<2mm
[x] ET cuts for barrel (and if possible for endcap)
[x] ratio hcal/ecal
[ ] Isolation (figure out a threshold by comparing the final signal sample with the background)
[x] require opposite charge leptons for the invariant mass reco
[x] If possible exclude Z's from the signal by looking at gen electrons with mother pdgid=23

HepUsfq2021 / LEDAnalysis