ALICE实验光子谱仪PHOS的标定
Calibration of the photon spectrometer PHOS of the ALICE experiment
摘要：
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、非线性修正系数的获得以及时间相关校准修正的计算方法，并以$\sqrt{s}$ = 13 TeV质子-质子（pp）碰撞中的PHOS性能为例进行了说明。经过所有修正后，对$p_{\rm{T}} > 1.7$ GeV/ $c$的$π^0$和$η$介子的质量分辨分别为$σ_m^{π^0} = 4.56 \pm 0.03$ MeV/ $c^2$和$σ_m^η = 15.3 \pm 1.0$ MeV/ $c^2$.
英文摘要：
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 $π^0$ and $η$ mesons for $p_{\rm{T}} > 1.7$ GeV/$c$ are $σ_m^{π^0} = 4.56 \pm 0.03$ MeV/$c^2$ and $σ_m^η = 15.3 \pm 1.0$ MeV/$c^2$, respectively.
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