ePIC Jet Reco. Task Force
Discussion Notes
Derek Anderson
03.14.2023

Meeting start: 3:05 PM ET

Associated particles container
  - Will be used to store jet constituents until PODIO
    one-to-many issue is fixed
  - Uses PDG type & value fields:
      > PDG type = 0  --> particle is from a jet
      > PDG value = i --> associated jet index
  - Currently in the PR for jet factories

Jet parameters for sim campaign
  - Parameters to set:
      > Jet R
      > Jet algo
      > Min particle pT
      > Min jet pT
      > Recomb scheme
  - Values to use:
      > Jet R = 1
      > Jet algo = anti-kT
      > Min particle pT
        * Reco  = min pT for far-forward/backward trackers
        * Truth = 0 GeV
      > Min jet pT = will be set by far-forward/backward
        trackers
      > Recomb scheme = E-scheme

After PR gets merged, aim to test things before sim
campaign
  - Look at Pythia event:
    > Cluster jets independently w/ same parameters, and
      make sure EICrecon produces the same jets

For reconstructed particles, we'll want to exclude
scattered electrons from jets
  - Need an electron finder even at MC level b/c 
    scattered electrons can't be explicitly tagged
  - LO approach is to exclude all electrons
    > Or could exlude highest momentum electron
    > But this breaks down at high rapidity since
      you can have low p but high E electrons
  - We'll have DIS events as part of this
    campaign, so we need to do this now
    > Let's do this:
      * Reco Level  = Exclude highest energy
                      electron
      * Truth Level = Exclude all electrons

Meeting end: 3:34 pm ET