论文标题
$ \ sqrt {s _ {\ mathrm {nn}}}} = 5.02 $ TEV
ALICE luminosity determination for Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.02$ TeV
论文作者
论文摘要
爱丽丝实验中的亮度确定基于范德梅尔扫描中的测量，用于涉及一个或多个检测器（可见的横截面）的可见过程的横截面。在2015年和2018年，大型强子对撞机以$ \ sqrt {s _ {\ rm nn}} = 5.02 $ tev提供了pb $ - $ pb碰撞。在Van der Meer扫描中测量了两个可见的横截面，与零度量热计（ZDC）和V0检测器中的颗粒检测相关。本文介绍了实验设置和分析程序，并提出了测量结果。与以前的爱丽丝研究相比，该分析涉及对梁相关效应的全面研究和改进的拟合程序，以提取可见的横截面。完整样本的基于ZDC的不确定性和基于V0的光度测量值为2.5％。 $ \ sqrt {s _ {\ rm nn}} = 5.02 $ tev，通过效率校正基于V0的可见横截面获得的无弹性横截面，以$ \ sqrt {s _ {s _ {\ rm nn}} = 5.02 $ TEV获得，该横截面的效率为$ 7.67 \ pm pm 0.25 $ b，使用glauuber模型达成$ 7.67 \ pm pm 0.25 $ b。
Luminosity determination within the ALICE experiment is based on the measurement, in van der Meer scans, of the cross sections for visible processes involving one or more detectors (visible cross sections). In 2015 and 2018, the Large Hadron Collider provided Pb$-$Pb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\rm NN}} = 5.02$ TeV. Two visible cross sections, associated with particle detection in the Zero Degree Calorimeter (ZDC) and in the V0 detector, were measured in a van der Meer scan. This article describes the experimental set-up and the analysis procedure, and presents the measurement results. The analysis involves a comprehensive study of beam-related effects and an improved fitting procedure, compared to previous ALICE studies, for the extraction of the visible cross section. The resulting uncertainty of both the ZDC-based and the V0-based luminosity measurement for the full sample is 2.5%. The inelastic cross section for hadronic interactions in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV, obtained by efficiency correction of the V0-based visible cross section, was measured to be $7.67 \pm 0.25$ b, in agreement with predictions using the Glauber model.
