postprocessors

Postprocessing of nanoAOD

Official examples

Official examples can by found in https://github.com/cms-nanoAOD/nanoAOD-tools/tree/master/python/postprocessing/examples

Simple example of skimming

A simple example of a postprocessor that skims a nanoAOD file by applying a simple preselection and selecting branches, can be found in

./skim_example.py

Both the input and output files are of the nanoAOD format.

Simple analysis example

A simple example of a postprocessor with a simple analysis code in modules/ModuleSimple.py can be run as

./simple_example.py

The input file should be in the nanoAOD format. The output file will be created by the analysis module itself (TreeProducerSimple), as opposed to the postprocessor, which is has setting noOut=True. The output file contains a custom tree with variables needed for the analysis.

Example of applying jet/MET corrections

There are two example postprocessors that apply jet/MET corrections meant for local testing.

• jme_test_central.py uses the official JME tools, has output in the nanoAOD format.
• jme_test_custom.py uses the JME tools in of this framework (corrections/JetMETCorrectionTool.py), has a custom analysis output according to modules/ModuleSimpleJME.py.

Complete example of skimming

skim.py is a complete example of skimming of Run-II samples, including selecting data in the JSON (good run list), dropping unwanted branches, and applying latest JECs. It is meant to be submitted by submit_skim.py.

./skim.py -y 2017

Local analysis

For a local run of the ditau analysis in Run II, do something like

./local.py -c mutau -y 2017

Full analysis

job.py is a complete ditau analysis in Run-II, and is meant for job submission with submit.py.

./job.py -c mutau -y 2017 -i root://xrootd-cms.infn.it//store/mc/RunIIFall17NanoAODv4/DYJetsToLL_M-50_TuneCP5_13TeV-madgraphMLM-pythia8/NANOAODSIM/PU2017RECOSIMstep_12Apr2018_Nano14Dec2018_102X_mc2017_realistic_v6-v1/260000/CFDCF0D4-A3BD-E04B-89D5-1BE152CB8754.root