Speaker
Description
The measurement of the integrated luminosity recorded by the CMS detector at the LHC in proton-proton collisions during Run 2 and Run 3 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. Multiple independently-calibrated luminosity detectors (luminometers) are employed to derive the final integrated luminosity. In Run 2, a relative precision of 0.82 and 0.84% is achieved for the 2017 and 2018 data sets, respectively. 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. The dominant uncertainties are the luminometer nonlinearity and the assumption of transverse factorizability in the vdM method. The consistency of the measurements is evaluated using Z boson production rates. For Run 3, the luminosity detectors have been upgraded. Preliminary results have been obtained for the integrated luminosity in the 2022-2024 data-taking periods with a precision ranging between 1.3% and 1.6%. We expect final results will be available in time for this conference. Results for Heavy Ion collisions will also be presented.
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