Table of content

Official Recommendation

1. For 2016: https://twiki.cern.ch/twiki/bin/viewauth/CMS/PdmV2016Analysis
2. For 2017: https://twiki.cern.ch/twiki/bin/viewauth/CMS/PdmV2017Analysis
3. For 2018: https://twiki.cern.ch/twiki/bin/viewauth/CMS/PdmV2018Analysis

How to calulate luminosity

1. Load cms enviornment using cmsenv.
2. Set the brilcal environment:

   export PATH=$HOME/.local/bin:/cvmfs/cms-bril.cern.ch/brilconda/bin:$PATH
   

3. Install the latest version of brilcalc

   pip install --user --upgrade brilws
   

   Sometime you may get a strange error. Then try to uninstall the brilcalc and then reinstall it. Somehow it works many times.

   pip uninstall -y brilws
   

4. Get the luminosity:

   brilcalc lumi --normtag /cvmfs/cms-bril.cern.ch/cms-lumi-pog/Normtags/normtag_PHYSICS.json -u /fb  -i <JSON FILE PATH>/processedLumis.json
   

NOTE: For some reason this brilcalc command is not working on lpc. But it works fine on lxplus.

Reference

1. https://twiki.cern.ch/twiki/bin/view/CMS/BrilcalcQuickStart
2. Luminosity physics group
3. CMS Luminosity public plots
4. https://hypernews.cern.ch/HyperNews/CMS/get/physics-validation/3358.html