Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s = 7 TeV
Name
_2013_J._Inst._8_P09009.pdf
Description
Published version
Size
3.24 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Apyan, Aram
Bauer, Gerry P
Busza, Wit
Butz, Erik M.
Cali, Ivan Amos
Chan, M.
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Kim, Y.
Date Issued
September 2013
Journal
Journal of Instrumentation
Publisher
IOP Publishing
Citation
Chatrchyan, S. et al. "Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s = 7 TeV." Journal of Instrumentation 5 (September 2013): P09009 © 2013 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
The energy calibration and resolution of the electromagnetic calorimeter (ECAL) of the CMS detector have been determined using proton-proton collision data from LHC operation in 2010 and 2011 at a centre-of-mass energy of √s = 7 TeV with integrated luminosities of about 5fbinv. Crucial aspects of detector operation, such as the environmental stability, alignment, and synchronization, are presented. The in-situ calibration procedures are discussed in detail and include the maintenance of the calibration in the challenging radiation environment inside the CMS detector. The energy resolution for electrons from Z-boson decays is better than 2% in the central region of the ECAL barrel (for pseudorapidity |η| < 0.8) and is 2-5% elsewhere. The derived energy resolution for photons from 125 GeV Higgs boson decays varies across the barrel from 1.1% to 2.6% and from 2.2% to 5% in the endcaps. The calibration of the absolute energy is determined from Ze→+e - decays to a precision of 0.4% in the barrel and 0.8% in the endcaps.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 3.0 unported license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/1748-0221/8/09/P09009
