Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at √s = 8 TeV

CMS Collaboration

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Abstract

A description is provided of the performance of the CMS detector for photon reconstruction and identification in proton-proton collisions at a centre-of-mass energy of 8 TeV at the CERN LHC. Details are given on the reconstruction of photons from energy deposits in the electromagnetic calorimeter (ECAL) and the extraction of photon energy estimates. The reconstruction of electron tracks from photons that convert to electrons in the CMS tracker is also described, as is the optimization of the photon energy reconstruction and its accurate modelling in simulation, in the analysis of the Higgs boson decay into two photons. In the barrel section of the ECAL, an energy resolution of about 1% is achieved for unconverted or late-converting photons from H → γγ decays. Different photon identification methods are discussed and their corresponding selection efficiencies in data are compared with those found in simulated events.
Original languageEnglish
Article numberP08010
Number of pages60
JournalJournal of Instrumentation
Volume10
Issue number8
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Pattern recognition
  • cluster finding
  • calibration and fitting methods; Performance of High Energy Physics Detectors

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