Compact Muon Solenoid
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| CMS-PAS-LUM-20-002 | ||
| CMS luminosity measurement for nucleus-nucleus collisions at √sNN= 5.02 TeV in Run 2 | ||
| CMS Collaboration | ||
| 22 July 2024 | ||
| Abstract: The measurements of the luminosity delivered to the CMS experiment during the lead-lead (PbPb) data taking in 2015 and 2018 are presented. The nucleon-nucleon collisions were recorded at a center-of-mass energy of 5.02 TeV, with the 2018 data sample being three times larger than that of 2015. Three subdetectors are used: the fast beam conditions monitor, the forward hadron calorimeter, and the pixel luminosity telescope. The absolute luminosity calibration is determined using the so-called van der Meer (vdM) technique that relies on transverse beam separation scans. The dominant sources of uncertainty are the transverse factorizability of the bunch density profiles, and in 2015, the cross-detector consistency. The total uncertainty on the integrated luminosity, considering also the stability of the vdM-calibrated subdetector response over time, amounts to 3.0% for 2015, and 1.7% for 2018. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to EPJC. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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