@article{3158685,
    title = "Energy calibration and resolution of the CMS electromagnetic calorimeter
in pp collisions at root s=7 TeV",
    author = "Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and and Adam, W. and Bergauer, T. and Dragicevic, M. and Eroe, J. and and Fabjan, C. and Friedl, M. and Fruehwirth, R. and Ghete, V. M. and and Hoermann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and and Knuenz, V. and Krammer, M. and Kraetschmer, I. and Liko, D. and Mikulec, and I. and Rabady, D. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and and Schoefbeck, R. and Strauss, J. and Taurok, A. and and Treberer-Treberspurg, W. and Waltenberger, W. and Wulz, C. -E. and and Mossolov, V. and Shumeiko, N. and Suarez Gonzalez, J. and Alderweireldt, and S. and Bansal, M. and Bansal, S. and Cornelis, T. and De Wolf, E. A. and and Janssen, X. and Knutsson, A. and Luyckx, S. and Mucibello, L. and and Ochesanu, S. and Roland, B. and Rougny, R. and Van Haevermaet, H. and and Van Mechelen, P. and Van Remortel, N. and Van Spilbeeck, A. and Blekman, and F. and Blyweert, S. and D'Hondt, J. and Kalogeropoulos, A. and Keaveney, and J. and Maes, M. and Olbrechts, A. and Tavernier, S. and Van Doninck, W. and and Van Mulders, P. and Van Onsem, G. P. and Villella, I. and Clerbaux, and B. and De Lentdecker, G. and Favart, L. and Gay, A. P. R. and Hreus, T. and and Leonard, A. and Marage, P. E. and Mohammadi, A. and Reis, T. and and Seva, T. and Thomas, L. and Vander Velde, C. and Vanlaer, P. and Wang, and J. and Adler, V. and Beernaert, K. and Benucci, L. and Cimmino, A. and and Costantini, S. and Dildick, S. and Garcia, G. and Klein, B. and and Lellouch, J. and Marinov, A. and Mccartin, J. and Ocampo Rios, A. A. and and Ryckbosch, D. and Sigamani, M. and Strobbe, N. and Thyssen, F. and and Tytgat, M. and Walsh, S. and Yazgan, E. and Zaganidis, N. and Basegmez, and S. and Beluffi, C. and Bruno, G. and Castello, R. and Caudron, A. and and Ceard, L. and Delaere, C. and du Pree, T. and Favart, D. and Forthomme, and L. and Giammanco, A. and Hollar, J. and Lemaitre, V. and Liao, J. and and Militaru, O. and Nuttens, C. and Pagano, D. and Pin, A. and and Piotrzkowski, K. and Popov, A. and Selvaggi, M. and Vizan Garcia, J. M. and and Beliy, N. and Caebergs, T. and Daubie, E. and Hammad, G. H. and and Alves, G. A. and Correa Martins Junior, M. and Martins, T. and Pol, M. and E. and Souza, M. H. G. and Alda Junior, W. L. and Carvalho, W. and and Chinellato, J. and Custodio, A. and Da Costa, E. M. and De Jesus Damiao, and D. and De Oliveira Martins, C. and Fonseca De Souza, S. and Malbouisson, and H. and Malek, M. and Matos Figueiredo, D. and Mundim, L. and Nogima, H. and and Prado Da Silva, W. 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    journal = "Journal of Instrumentation",
    year = "2013",
    volume = "8",
    publisher = "IOP Publishing Ltd",
    issn = "1748-0221",
    doi = "10.1088/1748-0221/8/09/P09009",
    keywords = "Gamma detectors (scintillators, CZT, HPG, HgI etc); Calorimeters; Large
detector systems for particle and astroparticle physics",
    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 root s = 7 TeV with integrated luminosities of about 5 fb(-1).
Crucial aspects of detector operation, such as the environmental
stability, alignment, and synchronozation, 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 vertical bar eta vertical bar < 0.8) and is
2-5% elsewhere. The derived energy resolution for photons from 125GeV
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."
}