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Superchic_i: Add python class converting LHE file for Pythia

Krzysztof Ciesla requested to merge kciesla/athena:master-superchic-lheconverter into master

This MR adds python class for conversion of SuperChic's output LHE file contents to ones accepted by Pythia for correct FSR simulation. It should only be used for γγ -> ll processes.

  • Replaces init block: changes beam particles from ions to muons and their energy to be equal to ion beam.
  • Changes photon: px and py to zero and energy to pz.
  • Recalculates energy scale to be equal: (pT_l1 + pT_l2) / 2

Example: /afs/cern.ch/user/k/kciesla/public/master-superchic-lheconverter/run

Pinging: @mdyndal

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