Calibration of the photon spectrometer PHOS of the ALICE experiment

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 $\sqrt{s}$ = 13 TeV. After applying all corrections, the achieved mass resolutions for ${\pi }^0$ and $\eta$ mesons for $p_{\mathrm{T}}>1.7$ GeV/$c$ are ${\sigma }_m^{{\pi }^0}=4.56\pm 0.03$ MeV/$c^2$ and ${\sigma }_m^{\eta }=15.3\pm 1.0$ MeV/$c^2$, respectively.

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

References in corpus (4)

• An Introduction to PYTHIA 8.2
• Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
• Direct photon elliptic flow in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Neutral pion and $\eta$ meson production in p-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.02$ TeV

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• Data-driven precision determination of the material budget in ALICE
• Performance of the ALICE electromagnetic calorimeters in LHC Runs 1 and 2 and upgrade projects
• Measurement of the inclusive isolated-photon production cross section in pp collisions at $\sqrt{s}$ = 13 TeV
• Nuclear modification factor of light neutral-meson spectra up to high transverse momentum in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV