Calibration of the photon spectrometer PHOS of the ALICE experiment

Summary, in English

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.

• Author: S Acharya; Jonatan Adolfsson; Peter Christiansen; Martin Ljunggren; Adrian Nassirpour; Anders Oskarsson; Tuva Richert; Omar Vazquez Rueda; David Silvermyr; Evert Stenlund; N Zurlo
• Department/s: Particle and nuclear physics; eSSENCE: The e-Science Collaboration
• Publishing year: 2019-05-28
• Language: English
• Publication/Series: Journal of Instrumentation
• Volume: 14
• Issue: May 2019
• Links: http://dx.doi.org/10.1088/1748-0221/14/05/P05025
• Document type: Journal article
• Publisher: IOP Publishing
• Topic: Subatomic Physics
• Keywords: Instruments; Electromagnetic calorimeter; Energy calibration; Gain calibration; High granularity; Mass resolution; Nonlinearity correction; Photon spectrometer; Time dependent; Calibration
• Status: Published
• ISBN/ISSN/Other: ISSN: 1748-0221