Calibration of the photon spectrometer PHOS of the ALICE experiment - INSPIRE

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Calibration of the photon spectrometer PHOS of the ALICE experiment

ALICE

Collaboration

Feb 16, 2019

27 pages

Published in:

JINST 14 (2019) 05, P05025

Published: May 28, 2019

e-Print:

1902.06145 [physics.ins-det]

DOI:

10.1088/1748-0221/14/05/P05025

Report number:

CERN-EP-2019-020

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (IOP)

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.

Note:

27 pages, 18 captioned figures, 1 table, authors from page 22, published version, figures at http://alice-publications.web.cern.ch/node/5096

energy: calibration
calorimeter: electromagnetic
alignment: geometrical
photon: spectrometer
ALICE
mass resolution
performance

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