Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at s= 7 TeV Academic Article uri icon


  • 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 5fb-1. 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 || < 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. 2013 CERN for the benefit of the CMS collaboration.

published proceedings

  • Journal of Instrumentation

author list (cited authors)

  • Chatrchyan, S., Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., ... Swanson, J.

complete list of authors

  • Chatrchyan, S||Khachatryan, V||Sirunyan, AM||Tumasyan, A||Adam, W||Bergauer, T||Dragicevic, M||Eroe, J||Fabjan, C||Friedl, M||Fruehwirth, R||Ghete, VM||Hoermann, N||Hrubec, J||Jeitler, M||Kiesenhofer, W||Knuenz, V||Krammer, M||Kraetschmer, I||Liko, D||Mikulec, I||Rabady, D||Rahbaran, B||Rohringer, C||Rohringer, H||Schoefbeck, R||Strauss, J||Taurok, A||Treberer-Treberspurg, W||Waltenberger, W||Wulz, C-E||Mossolov, V||Shumeiko, N||Suarez Gonzalez, J||Alderweireldt, S||Bansal, M||Bansal, S||Cornelis, T||De Wolf, EA||Janssen, X||Knutsson, A||Luyckx, S||Mucibello, L||Ochesanu, S||Roland, B||Rougny, R||Van Haevermaet, H||Van Mechelen, P||Van Remortel, N||Van Spilbeeck, A||Blekman, F||Blyweert, S||D'Hondt, J||Kalogeropoulos, A||Keaveney, J||Maes, M||Olbrechts, A||Tavernier, S||Van Doninck, W||Van Mulders, P||Van Onsem, GP||Villella, I||Clerbaux, B||De Lentdecker, G||Favart, L||Gay, APR||Hreus, T||Leonard, A||Marage, PE||Mohammadi, A||Reis, T||Seva, T||Thomas, L||Vander Velde, C||Vanlaer, P||Wang, J||Adler, V||Beerna

publication date

  • January 1, 2013 11:11 AM