Hadronization and Underlying Event Correction Factor

I generated a pythia sample using the parameters used for the official jet sample production in the usual partonic pt bins. I let pythia do the jet finding over the final state particles. I then edited the event record so that it could do jet finding at the partonic level. The partonic level jets only include the results of final state radiation. I then calculated the cross section for jets at the partonic and particle levels. The correction factors are the ratio of particle/partonic.

Cuts on inclusive jets:

  • |jet eta| < 0.9

Cuts on dijets:

  • |jet1 eta| < 0.9
  • |jet2 eta| < 0.9
  • |eta1 - eta2| < 1.37
  • |phi1 - phi2| > 2.0
  • jet1 Et > 10 GeV
  • jet2 Et > 7 GeV

Figure 1 (inclusive jets):

Figure 2 (dijets):