Calibration of the photon spectrometer PHOS of the ALICE experiment
Calibration of the photon spectrometer PHOS of the ALICE experiment
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DOI：
10.1088/1748-0221/14/05/p05025
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发表时间：
2019-02
影响因子：
1.3
通讯作者：
Alice Collaboration
中科院分区：
文献类型：
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作者：
Alice Collaboration
本文介绍了ALICE实验中高粒度电磁量能器PHOS的能量刻度过程。讨论了相对增益校准、几何校准和相应的绝对能量标度修正、非线性修正系数的计算以及时间相关校准修正的计算方法，并以13 TeV质子-质子（pp）碰撞中的PHOS性能为例进行了说明.经过各种修正后，得到了ρ T > 1时π 0和η介子的质量分辨. 7 GeV / c的σ π 0 m = 4。56 ± 0。03MeV/c2，σ η m = 15。3 ± 1。0 MeV/c2。
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 π 0 and η mesons for p T > 1 . 7 GeV / c are σ π 0 m = 4 . 56 ± 0 . 03 MeV/ c 2 and σ η m = 15 . 3 ± 1 . 0 MeV/ c 2 , respectively.