Calibration of the photon spectrometer PHOS of the ALICE experiment

ALICE Collaboration, S. Acharya, H.A. Andrews, D. Evans, K.L. Graham, O. Jevons, P.G. Jones, A. Jusko, M. Krivda, J. Kvapil, R. Lietava, E. Willsher, N. Zardoshti

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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 σmπ0 = 4.56 ± 0.03 MeV/c2 and σmη = 15.3 ± 1.0 MeV/c2, respectively.
Original languageEnglish
Article numberP05025
JournalJournal of Instrumentation
Issue number05
Publication statusPublished - 28 May 2019


  • calorimeters
  • detector alignment and calibration methods (lasers, sources, particle-beams))


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