Calibration of the photon spectrometer PHOS of the ALICE experiment

Research output: Contribution to journalArticle


The procedure for the energy calibration of the high granularity electromagnetic calorimeter PHOS of the ALICE experiment is presented. The methods used to perform the relative gain calibration, to evaluate the geometrical alignment and the corresponding correction of the absolute energy scale, to obtain the nonlinearity correction coefficients and finally, to calculate the time-dependent calibration corrections, are discussed and illustrated by the PHOS performance in proton-proton (pp) collisions at s=13 TeV. After applying all corrections, the achieved mass resolutions for π0 and η mesons for pT > 1.7 GeV/c are σm π0 = 4.56 ± 0.03 MeV/c2 and σm η = 15.3 ± 1.0 MeV/c2, respectively. 


External organisations
  • Niels Bohr Institute
  • University of Copenhagen
  • Variable Energy Cyclotron Centre
  • University of Brescia
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics


  • Instruments, Electromagnetic calorimeter, Energy calibration, Gain calibration, High granularity, Mass resolution, Nonlinearity correction, Photon spectrometer, Time dependent, Calibration
Original languageEnglish
Article numberP05025
JournalJournal of Instrumentation
Issue numberMay 2019
Publication statusPublished - 2019 May 28
Publication categoryResearch

Bibliographic note

Export Date: 9 August 2019