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Adding NNLOPS reweighting functionality

Jonathon Mark Langford requested to merge jlangfor/HiggsDNA:dev_NNLOPSreweight into master
  • Add function to event_weight_systematics.py to perform NNLOPS reweighting to ggH events
  • Only serves as a correction, not as a systematic uncertainty
  • Uses dataset_name to only reweight events with "ggH" in the name. This could be improved?
  • Builds linear splines from information stored in JSONs/NNLOPS_reweight.json. Correction factor depends on (truth) Higgs pt and njets, extracted from events.HTXS object

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