Calibration of the photon spectrometer PHOS of the ALICE experiment

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Abstract

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. 

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Niels Bohr Institute
  • University of Copenhagen
  • Variable Energy Cyclotron Centre
  • University of Brescia
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik

Nyckelord

Originalspråkengelska
ArtikelnummerP05025
TidskriftJournal of Instrumentation
Volym14
UtgivningsnummerMay 2019
StatusPublished - 2019 maj 28
PublikationskategoriForskning
Peer review utfördJa