CMS luminosity information, for 2010 CMS open data

Description

CMS measures the luminosity with different luminometers (luminosity detectors) and algorithms. For 2010, only those obtained with the Hadron Forward calorimeter's Zero Counting algorithm (hfoc) are available. Those are the values that can be found within the files in this record.

The integrated luminosity for validated runs and luminosity sections of all 2010 p-p data taking is available in the table 2010lumi.txt. It includes 2010 RunA and RunB. The values for 2010 RunB data taking are also available separately in 2010RunBlumi.txt.

In your estimate for the integrated luminosity, check for which runs the trigger you have selected is active and sum the values for those runs. If you are using prescaled triggers, you can find the trigger prescale factors as shown in the trigger examples. The uncertainty in the luminosity measurement of 2010 data should be considered as 11% (reference CMS PAS EWK-10-004).

The detailed list of luminosity by lumi section is in 2010lumibyls.csv for the list of validated runs and lumi sections.

Note that if there are orphan lumi sections listed at the bottom of the lumi files as in json but not in results, they can be safely ignored. These lumi sections have no events as they correspond to the very end of runs for which the stable beam flag was not disabled yet during acquisition.

Additional information on how to extract luminosity values using the brilcalc tool can be found in the luminosity calculation guide.