Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s = 7 TeV

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dc.citation.firstpageP09009
dc.citation.journalTitleJournal of Instrumentation
dc.citation.volumeNumber8
dc.contributor.authorAdair, A.
dc.contributor.authorAkgun, B.
dc.contributor.authorEcklund, K.M.
dc.contributor.authorGeurts, F.J.M.
dc.contributor.authorLi, W.
dc.contributor.authorPadley, B.P.
dc.contributor.authorRedjimi, R.
dc.contributor.authorRoberts, J.
dc.contributor.authorZabel, J.
dc.date.accessioned2015-07-14T16:10:35Z
dc.date.available2015-07-14T16:10:35Z
dc.date.issued2013
dc.description.abstractThe 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 5\fbinv. 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 Z→e+e− decays to a precision of 0.4% in the barrel and 0.8% in the endcaps.
dc.identifier.citationAdair, A., Akgun, B., Ecklund, K.M., et al.. "Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s = 7 TeV." <i>Journal of Instrumentation,</i> 8, (2013) IOP Publishing: P09009. http://dx.doi.org/10.1088/1748-0221/8/09/P09009.
dc.identifier.doihttp://dx.doi.org/10.1088/1748-0221/8/09/P09009
dc.identifier.urihttps://hdl.handle.net/1911/80962
dc.language.isoeng
dc.publisherIOP Publishing
dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.titleEnergy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s = 7 TeV
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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