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Article
Report number arXiv:2403.15518 ; CMS-EGM-18-002 ; CERN-EP-2024-014 ; CMS-EGM-18-002-003
Title Performance of the CMS electromagnetic calorimeter in pp collisions at s= 13 TeV
Author(s) CMS Collaboration  Mostra tots els 2372 autors
Corporate Author(s) CMS Collaboration
Publication 2024-09-04
Imprint 23 Mar 2024
Number of pages 63
Note Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EGM-18-002 (CMS Public Pages)
In: JINST 19 (2024) P09004
DOI 10.1088/1748-0221/19/09/P09004 (publication)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; CMS
Free keywords detector
Abstract The operation and performance of the Compact Muon Solenoid (CMS) electromagnetic calorimeter (ECAL) are presented, based on data collected in pp collisions at s= 13 TeV at the CERN LHC, in the years from 2015 to 2018 (LHC Run 2), corresponding to an integrated luminosity of 151 fb1. The CMS ECAL is a scintillating lead-tungstate crystal calorimeter, with a silicon strip preshower detector in the forward region that provides precise measurements of the energy and the time-of-arrival of electrons and photons. The successful operation of the ECAL is crucial for a broad range of physics goals, ranging from observing the Higgs boson and measuring its properties, to other standard model measurements and searches for new phenomena. Precise calibration, alignment, and monitoring of the ECAL response are important ingredients to achieve these goals. To face the challenges posed by the higher luminosity, which characterized the operation of the LHC in Run 2, the procedures established during the 2011-2012 run of the LHC have been revisited and new methods have been developed for the energy measurement and for the ECAL calibration. The energy resolution of the calorimeter, for electrons from Z boson decays reaching the ECAL without significant loss of energy by bremsstrahlung, was better than 1.8%, 3.0%, and 4.5% in the |η| intervals [0.0, 0.8], [0.8, 1.5], [1.5, 2.5], respectively. This resulting performance is similar to that achieved during Run 1 in 2011-2012, in spite of the more severe running conditions.
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Copyright/License Preprint: © 2024-2025 CERN (License: CC-BY-4.0)



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