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Fix applying the dimuon trigger

Louis Moureaux requested to merge lmoureau/das-core:bugfix/apply-muon-trigger into main

The event weight for the trigger was never applied, so all events were kept - even ones not passing the trigger. This caused a ~20% normalization issue in Drell-Yan.

This is factorized from the ongoing effort on reducing the size of ntuple files (TTree friends).

See https://gitlab.cern.ch/cms-analysis/general/DasAnalysisSystem/campaigns/0019/-/issues/1.

After this MR, the normalization difference in Z->µµ is down to a few percents and no longer visible on a log axis:

image

Edited by Louis Moureaux

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