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Intercalibration of the barrel electromagnetic calorimeter of the CMS experiment at start-up

Adzic, P. and Alemany-Fernandez, R. and Almeida, N. and Anagnostou, G. and Andelin, D. and Anfreville, M. and Anicin, I. and Antunovic, Z. and Arcidiacono, R. and Arenton, M. W. and Auffray, E. and Argiro, S. and Askew, A. and Atramentov, O. and Baccaro, S. and Baffioni, S. and Balazs, M. and Barney, D. and Barone, L. M. and Bartoloni, A. and Baty, C. and Bandurin, D. and Beauceron, S. and Bell, K. W. and Benetta, R. and Bercher, M. and Bernet, C. and Berthon, U. and Besancon, M. and Betev, B. and Beuselinck, R. and Biino, C. and Blaha, J. and Bloch, P. and Blyth, S. and Bornheim, A. and Bourotte, J. and Brett, A. M. and Brown, R. M. and Britton, D. and Buehler, M. and Busson, P. and Camanzi, B. and Camporesi, T. and Carrera, E. and Cartiglia, N. and Cavallari, F. and Cerutti, M. and Chang, P. and Chang, Y. H. and Charlot, C. and Chen, E. A. and Chen, W. T. and Chen, Z. and Chipaux, R. and Choudhary, B. C. and Choudhury, R. K. and Cockerill, D. J. 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Calibration of the relative response of the individual channels of the barrel electromagnetic calorimeter of the CMS detector was accomplished, before installation, with cosmic ray muons and test beams. One fourth of the calorimeter was exposed to a beam of high energy electrons and the relative calibration of the channels, the intercalibration, was found to be reproducible to a precision of about 0.3%. Additionally, data were collected with cosmic rays for the entire ECAL barrel during the commissioning phase. By comparing the intercalibration constants obtained with the electron beam data with those from the cosmic ray data, it is demonstrated that the latter provide an intercalibration precision of 1.5% over most of the barrel ECAL. The best intercalibration precision is expected to come from the analysis of events collected in situ during the LHC operation. Using data collected with both electrons and pion beams, several aspects of the intercalibration procedures based on electrons or neutral pions were investigated.

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Additional Information:© 2008 IOP Publishing Ltd and SISSA. Received 15 September 2008, accepted for publication 24 October 2008. Published 30 October 2008. We thank the technical and administrative staff at CERN and other CMS Institutes, and acknowledge financial support from: CERN, Department of Atomic Energy and Department of Science and Technology of India, U.S. Department of Energy, U.S. National Science Foundation, Croatian Ministry of Science, Education and Sport (under grant No. 023-0982887-3064), French CNRS/Institut de Physique Nucleaire et de Physique des Particules, French Commissariat a l’Energie Atomique, Greek General Secretariat for Research and Technology, Italian Istituto Nazionale di Fisica Nucleare, Federal Agency for Science and Innovations of the Ministry for Education and Science of the Russian Federation, Federal Agency for Atomic Energy of the Russian Federation, Russian Academy of Sciences, Ministry of Science and Technological Development of Serbia, Swiss Funding Agencies, Science and Technology Facilities Council (UK).
Funding AgencyGrant Number
Department of Atomic Energy (India)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Croatian Ministry of Science, Education and Sport023-0982887-3064
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
General Secretariat for Research and Technology (GSRT)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Ministry for Education and Science of the RussianUNSPECIFIED
Federal Agency for Atomic Energy of the Russian FederationUNSPECIFIED
Russian Academy of SciencesUNSPECIFIED
Ministry of Science and Technological Development of SerbiaUNSPECIFIED
Swiss Funding AgenciesUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Department of Science and Technology (India)UNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)UNSPECIFIED
Subject Keywords:Calorimeters; Large detector systems for particle and astroparticle physics
Record Number:CaltechAUTHORS:20090619-075709365
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14415
Deposited By: Ruth Sustaita
Deposited On:13 Aug 2009 17:53
Last Modified:22 Sep 2016 22:50

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