Pileup Reweighting

Pileup Reweighting

Pileup reweighting is performed in order to reweight the true number of pu interactions in MonteCarlo to match the data ones.

• Generate the PU distributions (1D)

python python/puDistributions.py -r -e /store/user/amarini/Nero/v0.4/  -f aux/pileup.root

• or Run Dependent( RD )

python python/puDistributions.py -r -e /store/user/amarini/Nero/v0.4/ --run=0,1000,2000,3000 -f aux/pileupRD.root

WARNING RD PU Reweighting has never been tested.

• add to these files the pileup distributions in data, with names (or target):

  • PU-pileup
  • PU-pileupUp
  • PU-pileupDown

• or for the RD model:

  • RD-pileup_run1_run2
  • RD-pileupUp_run1_run2
  • RD-pileupDown_run1_run2

• modify the configuration file for using these files. The pileupRun and pileupLumi keys controls the RD vs 1D model. In case of RD MC and pileup, there is the need to have RD luminosity normalization as well.