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

被引:136
作者
Chatrchyan, S. [1 ]
Khachatryan, V. [1 ]
Sirunyan, A. M. [1 ]
Tumasyan, A. [1 ]
Adam, W. [2 ]
Bergauer, T. [2 ]
Dragicevic, M. [2 ]
Eroe, J. [2 ]
Fabjan, C. [2 ,186 ]
Friedl, M. [2 ]
Fruehwirth, R. [2 ,186 ]
Ghete, V. M. [2 ]
Hoermann, N. [2 ]
Hrubec, J. [2 ]
Jeitler, M. [2 ,186 ]
Kiesenhofer, W. [2 ]
Knuenz, V. [2 ]
Krammer, M. [2 ,186 ]
Kraetschmer, I. [2 ]
Liko, D. [2 ]
Mikulec, I. [2 ]
Rabady, D. [2 ,120 ]
Rahbaran, B. [2 ]
Rohringer, C. [2 ]
Rohringer, H. [2 ]
Schoefbeck, R. [2 ]
Strauss, J. [2 ]
Taurok, A. [2 ]
Treberer-Treberspurg, W. [2 ]
Waltenberger, W. [2 ]
Wulz, C. -E. [2 ,186 ]
Mossolov, V. [3 ]
Shumeiko, N. [3 ]
Suarez Gonzalez, J. [3 ]
Alderweireldt, S. [4 ]
Bansal, M. [4 ]
Bansal, S. [4 ]
Cornelis, T. [4 ]
De Wolf, E. A. [4 ]
Janssen, X. [4 ]
Knutsson, A. [4 ]
Luyckx, S. [4 ]
Mucibello, L. [4 ]
Ochesanu, S. [4 ]
Roland, B. [4 ]
Rougny, R. [4 ]
Van Haevermaet, H. [4 ]
Van Mechelen, P. [4 ]
Van Remortel, N. [4 ]
Van Spilbeeck, A. [4 ]
机构
[1] Yerevan Phys Inst, Yerevan, Armenia
[2] Inst Hochenergiephys OeAW, Vienna, Austria
[3] Natl Ctr Particle & High Energy Phys, Minsk, BELARUS
[4] Univ Antwerp, Antwerp, Belgium
[5] Free Univ Brussels, Brussels, Belgium
[6] Univ Ghent, Ghent, Belgium
[7] Univ Catholic Louvain, Louvain, Belgium
[8] Univ Mons, Mons, Belgium
[9] Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, Brazil
[10] Univ Estado Rio de Janeiro, BR-20550011 Rio De Janeiro, Brazil
[11] Univ Estadual Paulista, Sao Paulo, Brazil
[12] Univ Fed ABC, Sao Paulo, Brazil
[13] Inst Nucl Energy Res, Sofia, Bulgaria
[14] Univ Sofia, Sofia, Bulgaria
[15] Inst High Energy Phys, Beijing, Peoples R China
[16] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing, Peoples R China
[17] Univ Los Andes, Bogota, Colombia
[18] Tech Univ Split, Split, Croatia
[19] Univ Split, Split, Croatia
[20] Inst Rudjer Boskovic, Zagreb, Croatia
[21] Univ Cyprus, Nicosia, Cyprus
[22] Charles Univ Prague, Prague, Czech Republic
[23] Acad Sci Res & Technol Arab Republ Egypt, Egyptian Network High Energy Phys, Cairo, Egypt
[24] NICPB, Tallinn, Estonia
[25] Univ Helsinki, Dept Phys, Helsinki, Finland
[26] Helsinki Inst Phys, Helsinki, Finland
[27] Lappeenranta Univ Technol, Lappeenranta, Finland
[28] CEA Saclay, DSM IRFU, Gif Sur Yvette, France
[29] CNRS, IN2P3, Ecole Polytech, Lab Leprince Ringuet, Palaiseau, France
[30] Univ Strasbourg, Univ Haute Alsace Mulhouse, CNRS IN2P3, Inst Pluridisciplinaire Hubert Curien, Strasbourg, France
[31] CNRS, IN2P3, Inst Natl Phys Nucl & Phys Particules, Ctr Calcul, Villeurbanne, France
[32] Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France
[33] Tbilisi State Univ, Inst High Energy Phys & Informatizat, Tbilisi, Georgia
[34] Rhein Westfal TH Aachen, Inst Phys 1, Aachen, Germany
[35] Rhein Westfal TH Aachen, Phys Inst 3A, Aachen, Germany
[36] Rhein Westfal TH Aachen, Phys Inst 3B, Aachen, Germany
[37] DESY, Hamburg, Germany
[38] Univ Hamburg, Hamburg, Germany
[39] Univ Karlsruhe, Inst Expt Kernphys, Karlsruhe, Germany
[40] NCSR Demokritos, Inst Nucl & Particle Phys, Aghia Paraskevi, Greece
[41] Univ Athens, Athens, Greece
[42] Univ Ioannina, Ioannina, Greece
[43] KFKI Res Inst Particle & Nucl Phys, Budapest, Hungary
[44] Inst Nucl Res ATOMKI, Debrecen, Hungary
[45] Univ Debrecen, Debrecen, Hungary
[46] Natl Inst Sci Educ & Res, Bhubaneswar, Orissa, India
[47] Panjab Univ, Chandigarh, India
[48] Univ Delhi, Delhi, India
[49] Saha Inst Nucl Phys, Kolkata, India
[50] Bhabha Atom Res Ctr, Mumbai, India
基金
美国国家科学基金会; 欧洲研究理事会; 俄罗斯基础研究基金会; 芬兰科学院; 奥地利科学基金会; 英国科学技术设施理事会; 中国国家自然科学基金; 巴西圣保罗研究基金会;
关键词
Gamma detectors (scintillators; CZT; HPG; HgI etc); Calorimeters; Large detector systems for particle and astroparticle physics; RECONSTRUCTION; PERFORMANCE; SYSTEM;
D O I
10.1088/1748-0221/8/09/P09009
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
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.
引用
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页数:36
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