Calibration of the photon spectrometer PHOS of the ALICE experiment

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초록

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 root s = 13 TeV. After applying all corrections, the achieved mass resolutions for pi(0) and eta mesons for p(T) > 1.7 GeV/c are sigma(pi 0)(m) = 4.56 +/- 0.03 MeV/c(2) and sigma(eta)(m) = 15.3 +/- 1.0 MeV/c(2), respectively.

키워드

CalorimetersDetector alignment and calibration methods (lasers, sources, particlebeams)PB-PB COLLISIONSPHOTODIODESDETECTOR
제목
Calibration of the photon spectrometer PHOS of the ALICE experiment
저자
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DOI
10.1088/1748-0221/14/05/P05025
발행일
2019-05
유형
Article
저널명
Journal of Instrumentation
14