kreczko / root-dataframe-nanoaod

Example of processing NanoAOD files with RDataFrame

Example of processing NanoAOD files with RDataFrame

This project takes AOD files from CMS OpenData and rewrites these in a structure similar to the NanoAOD format (see here for documentation). The processed data is published on the CERN OpenData platform and contains data events taken with the CMS detector at the LHC during 2011. The output of the full toolchain described below results in the following plot of the Di-Muon spectrum.

Compare with the published CMS plot produced in 2011 (Link):

Setup CMSSW

source /cvmfs/cms.cern.ch/cmsset_default.sh
cmsrel CMSSW_5_3_32

Build module

cd CMSSW_5_3_32/src
cmsenv
mkdir workspace
cd workspace
git clone <THIS REPOSITORY> aod2nanoaod
cd aod2nanoaod
scram b -j8

Execute CMSSW config running conversion

cmsRun aod2nanoaod_cfg.py 2> log.txt

Postprocess ROOT file

cd scripts/
root -l -q postprocess_nanoaod.C

Build and run program analyzing the data with RDataFrame

# NOTE: Source recent ROOT version with RDataFrame support
# NOTE: The commited version of the program reads the file remotely from root.cern.ch.
./build.sh
./nanoaod_dimuon_spectrum

References

Reference project for implemenation of CMSSW analyzer:

http://opendata.cern.ch/record/5001

Documentation of physics objects in 2011 data:

http://opendata.cern.ch/docs/cms-physics-objects-2011

Getting started guide for CMS 2011 Open Data:

http://opendata.cern.ch/docs/cms-getting-started-2011

List of validated runs for primary datasets of 2011 data taking:

http://opendata.web.cern.ch/record/1001