2010-commissioning-dimuon

Validation code for 2010 Commissioning dataset, based on dimuon mass spectrum.

It is based on the original code in [http://opendata.cern.ch/record/461] on the CERN Open Data portal (Geiser, Achim; Dutta, Irene; Hirvonsalo, Harri; Sheeran, Bridget; (2016). Validation code for 2010 Commissioning dataset, based on dimuon mass spectrum. CERN Open Data Portal. DOI:10.7483/OPENDATA.CMS.W26R.J96R ) and modified here for direct download from github.

You need to work in a Virtual Machine properly contextualized for CMS. Everything is available on the CERN Open Data Portal http://opendata.cern.ch/VM/CMS/2010.

In order to run the demoanalyzer_cfg.py to create the Commissioning ROOT files, you need to create a working area and set up a proper CMS environment.

Creating the Working Area

This step is only needed the first time.

cmsrel CMSSW_4_2_8

Cloning the 2010-commissioning-dimuon repository from Github

Type this command to change directory:

cd CMSSW_4_2_8/src

For cloning type:

git clone git://github.com/cms-opendata-validation/2010-commissioning-dimuon  Validation/Commissioning_dimuon_2010

Setting up the CMS environment

cd Validation/Commissioning_dimuon_2010
cmsenv

Compiling and Running

scram b
cmsRun demoanalyzer_cfg.py

After analysis, Commissioning00val.root file should be created. Then, is necessary to change input and also output files in demoanalyzer_cfg.py, to save these changes and to rerun program. In the datesets directory in the repository from github are index files with names:

CMS_Run2010B_Commissioning_AOD_Apr21ReReco-v1_0000_file_index.txt CMS_Run2010B_Commissioning_AOD_Apr21ReReco-v1_0002_file_index.txt CMS_Run2010B_Commissioning_AOD_Apr21ReReco-v1_0003_file_index.txt CMS_Run2010B_Commissioning_AOD_Apr21ReReco-v1_0004_file_index.txt

These index files are the same as you can find in the open data portal record http://opendata.cern.ch/record/2 , they are copied here for convenience and for details of the analysis you can read comments in the analysis code DemoAnalyzer.cc .
It necessary to note that whole analysis can take around 8 hours!

When you rerun for all four index files you should have four root files with names: Commissioning00val.root Commissioning02val.root Commissioning03val.root Commissioning04val.root

The last thing what you should do is to merge these four root files into one root file. You do this as follow. In the downloaded repository is also file with name mergeCommissioning.C . Press command for opening ROOT program:

root

In this programe just type command:

.x mergeCommissioning.C .

This merging creates a root file called CommissioningAllval.root . To look at this output, write down command in ROOT program:

new TBrowser

and navigate to relevant file. The most interesting histogram is GM_mass_log. This is the validation histogram.