David Silvermyr
Senior lecturer
Calibration of the photon spectrometer PHOS of the ALICE experiment
Author
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.
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
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