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

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

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 de...

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Bibliographic Details
Main Authors: Apyan, Aram, Bauer, Gerry P, Busza, Wit, Butz, Erik M., Cali, Ivan Amos, Chan, M., Dutta, Valentina, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Kim, Y., Klute, Markus, Lai, Y. S., Levin, A., Luckey Jr, P David, Ma, T., Paus, Christoph M. E., Ralph, Duncan Kelley, Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Stockli, F., Sumorok, Konstanty C, Sung, K., Velicanu, D., Wolf, Roger, Wyslouch, Boleslaw, Yang, M., Yilmaz, Yetkin, Yoon, A. S., Zanetti, Marco, Wyslouch, Victoria, CMS Collaboration, Nahn, Steven
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:English
Published: IOP Publishing 2019
Online Access:https://hdl.handle.net/1721.1/121614
Description
Summary: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.

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