Common variables and their description for simple cut based electron ID + Isolation

• | Δη_In |
  • η difference between supercluster and position of inner track extrapolated from interaction vertex
• | Δφ_In |
  • φ difference between supercluster and position of inner track extrapolated from interaction vertex
• H/E
  • The ratio of Hcal tower energy (Depth1 + Depth2) within dR < 0.15 over Ecal seed cluster energy
• E/P
  • The ratio of the supercluster energy to the track momentum at the PCA to the beam spot
• σηη
  • The weighted cluster RMS along η inside 5x5 region of supercluster
• Ecal Isolation
  • Σ Ecal rec hit et in cone 0.4 with electron footprint removed
• Hcal Isolation
  • Σ Hcal tower (Depth1+Depth2) et in cone 0.4 with electron footprint removed
• Track Isolation
  • Σ Track pt in cone 0.4 with electron footprint removed

Note that as of today PAT default cone radius is 0.4 in all three isolations, details are here . In real data analysis one should use Egamma POG recommended. link to October exercise datasets:

• Zee here
• QCD 20-30 30-80

Example how to access eID and isolation variables via PatElectron

We consider you already know how to work with PAT, visit PatExamples for details Check out example code how to work with PAT

code snippet here

Example how to perfom electron ID optimization

Use Tag & Probe to test electron ID