@article{10902/25431,
year = {2013},
month = {9},
url = {http://hdl.handle.net/10902/25431},
abstract = {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 √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.},
organization = {We congratulate our colleagues in the CERN accelerator departments for the excellent performance
of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes
for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the
computing centres and personnel of the Worldwide LHC Computing Grid for delivering so effectively
the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring
support for the construction and operation of the LHC and the CMS detector provided by the following
funding agencies: the Austrian Federal Ministry of Science and Research and the Austrian
Science Fund; the Belgian Fonds de la Recherche Scientifique, and Fonds voor Wetenschappelijk
Onderzoek; the Brazilian Funding Agencies (CNPq, CAPES, FAPERJ, and FAPESP); the Bulgarian
Ministry of Education, Youth and Science; CERN; the Chinese Academy of Sciences, Ministry
of Science and Technology, and National Natural Science Foundation of China; the Colombian
Funding Agency (COLCIENCIAS); the Croatian Ministry of Science, Education and Sport; the
Research Promotion Foundation, Cyprus; the Ministry of Education and Research, Recurrent financing
contract SF0690030s09 and European Regional Development Fund, Estonia; the Academy
of Finland, Finnish Ministry of Education and Culture, and Helsinki Institute of Physics; the Institut
National de Physique Nucl´eaire et de Physique des Particules / CNRS, and Commissariat `a
l’ ´ Energie Atomique et aux ´ Energies Alternatives / CEA, France; the Bundesministerium f¨ur Bildung
und Forschung, Deutsche Forschungsgemeinschaft, and Helmholtz-Gemeinschaft Deutscher
Forschungszentren, Germany; the General Secretariat for Research and Technology, Greece; the
National Scientific Research Foundation, and National Office for Research and Technology, Hungary;
the Department of Atomic Energy and the Department of Science and Technology, India; the
Institute for Studies in Theoretical Physics and Mathematics, Iran; the Science Foundation, Ireland; 
the Istituto Nazionale di Fisica Nucleare, Italy; the Korean Ministry of Education, Science
and Technology and the World Class University program of NRF, Republic of Korea; the Lithuanian
Academy of Sciences; the Mexican Funding Agencies (CINVESTAV, CONACYT, SEP, and
UASLP-FAI); the Ministry of Science and Innovation, New Zealand; the Pakistan Atomic Energy
Commission; the Ministry of Science and Higher Education and the National Science Centre,
Poland; the Fundac¸ ˜ao para a Ciˆencia e a Tecnologia, Portugal; JINR (Armenia, Belarus, Georgia,
Ukraine, Uzbekistan); the Ministry of Education and Science of the Russian Federation, the
Federal Agency of Atomic Energy of the Russian Federation, Russian Academy of Sciences, and
the Russian Foundation for Basic Research; the Ministry of Science and Technological Development
of Serbia; the Secretar´ıa de Estado de Investigaci´on, Desarrollo e Innovaci´on and Programa
Consolider-Ingenio 2010, Spain; the Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF,
UniZH, Canton Zurich, and SER); the National Science Council, Taipei; the Thailand Center of
Excellence in Physics, the Institute for the Promotion of Teaching Science and Technology of
Thailand and the National Science and Technology Development Agency of Thailand; the Scientific
and Technical Research Council of Turkey, and Turkish Atomic Energy Authority; the Science
and Technology Facilities Council, U.K.; the US Department of Energy, and the US National Science
Foundation.
Individuals have received support from the Marie-Curie programme and the European Research
Council and EPLANET (European Union); the Leventis Foundation; the A. P. Sloan Foundation;
the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the
Fonds pour la Formation `a la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium);
the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of
Education, Youth and Sports (MEYS) of Czech Republic; the Council of Science and Industrial
Research, India; the Compagnia di San Paolo (Torino); the HOMING PLUS programme of Foundationfor Polish Science, cofinanced by EU, Regional Development Fund;},
publisher = {Institute of Physics},
publisher = {Journal of Instrumentation, 2013, 8, 09009},
title = {Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s = 7 TeV},
author = {Chatrchyan, S. and Brochero Cifuentes, Javier Andrés and Cabrillo Bartolomé, José Iban and Calderón Tazón, Alicia and Chuang, S. H. and Duarte Campderros, Jorge and Fernández García, Marcos and Gómez Gramuglio, Gervasio and González Sánchez, Francisco Javier and Graziano, Alberto and Jordá Lope, Clara and López Virto, María Amparo and Marco de Lucas, Jesús and Marco de Lucas, Rafael José and Martínez Rivero, Celso and Matorras Weinig, Francisco and Muñoz Sánchez, Francisca Javiela and Rodrigo Anoro, Teresa and Rodríguez Marrero, Ana Yaiza and Ruiz Jimeno, Alberto and Scodellaro, Luca and Vila Álvarez, Iván  and Vilar Cortabitarte, Rocío},
}