Published October 2008 | Version Published
Journal Article Open

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

Creators

  • 1. ROR icon University of Belgrade
  • 2. ROR icon Laboratory of Instrumentation and Experimental Particles Physics
  • 3. ROR icon University of Virginia
  • 4. ROR icon CEA Saclay
  • 5. ROR icon University of Split
  • 6. ROR icon University of Turin
  • 7. ROR icon European Organization for Nuclear Research
  • 8. ROR icon Florida State University
  • 9. ROR icon Sapienza University of Rome
  • 10. ROR icon Laboratoire d'Annecy-le-Vieux de Physique des Particules
  • 11. ROR icon Leprince-Ringuet Laboratory
  • 12. ROR icon Kansas State University
  • 13. ROR icon Rutherford Appleton Laboratory
  • 14. ROR icon ETH Zurich
  • 15. ROR icon Imperial College London
  • 16. ROR icon National Central University
  • 17. ROR icon California Institute of Technology
  • 18. ROR icon National Taiwan University
  • 19. ROR icon University of Delhi
  • 20. ROR icon Bhabha Atomic Research Centre
  • 21. ROR icon University of Trieste
  • 22. ROR icon University of Bristol
  • 23. ROR icon Paul Scherrer Institute
  • 24. ROR icon University of Milano-Bicocca
  • 25. ROR icon Cornell University
  • 26. ROR icon University of Ioannina
  • 27. ROR icon University of Minnesota
  • 28. ROR icon Institute for Nuclear Research
  • 29. ROR icon Brunel University London
  • 30. ROR icon University of Notre Dame
  • 31. ROR icon Institute for High Energy Physics
  • 32. ROR icon Northeastern University
  • 33. ROR icon University of Cyprus
  • 34. ROR icon Princeton University
  • 35. ROR icon P.N. Lebedev Physical Institute of the Russian Academy of Sciences
  • 36. ROR icon Alikhanyan National Laboratory
  • 37. ROR icon Joint Institute for Nuclear Research

Abstract

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.

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).

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Additional details

Identifiers

Eprint ID
14415
Resolver ID
CaltechAUTHORS:20090619-075709365

Funding

CERN
Department of Atomic Energy (India)
Department of Energy (DOE)
NSF
Croatian Ministry of Science, Education and Sport
023-0982887-3064
Centre National de la Recherche Scientifique (CNRS)
Commissariat à l'Energie Atomique (CEA)
General Secretariat for Research and Technology (GSRT)
Istituto Nazionale di Fisica Nucleare (INFN)
Ministry for Education and Science of the Russian
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 (STFC)
Department of Science and Technology (India)
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)

Dates

Created
2009-08-13
Created from EPrint's datestamp field
Updated
2021-11-08
Created from EPrint's last_modified field

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