Compact Muon Solenoid
LHC, CERN
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| CMS-PAS-LUM-20-001 | ||
| Precision luminosity measurement in proton-proton collisions at $ \sqrt{s}= $ 13 TeV with the CMS detector | ||
| CMS Collaboration | ||
| 2025-08-23 | ||
| Abstract: The measurement of the integrated luminosity recorded by the CMS detector at the LHC in proton-proton collisions at $ \sqrt{s}= $ 13 TeV in 2017 and 2018 is reported. The absolute luminosity calibration is obtained with the van der Meer (vdM) method through beam-separation scans that were performed in special accelerator conditions. The extrapolation to regular data-taking conditions relies on detector-specific measurements. Multiple independently calibrated luminosity detectors (luminometers) are employed to derive the final integrated luminosity. A relative precision of 0.82 and 0.84% is achieved for the 2017 and 2018 data sets, respectively. Dominant uncertainties are the luminometer nonlinearity and the assumption of transverse factorizability in the vdM method. The consistency of the measurements for 2016, 2017, and 2018 is evaluated using Z boson rates. When combined with the 2015--2016 data sets at the same center-of-mass energy, the relative precision of the total integrated luminosity is 0.73%, representing the most precise luminosity measurement ever achieved at bunched-beam hadron colliders. This is possible due to improved vdM methodology and the combination of results by independent luminometers. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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