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arXiv 2104.01927hep-ex
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2015年和2016年在CMS进行的$\sqrt{s} =$ 13 TeV质子-质子碰撞中的精确光度测量

Precision luminosity measurement in proton-proton collisions at $\sqrt{s} =$ 13 TeV in 2015 and 2016 at CMS

CMS Collaboration

摘要:

报道了2015年和2016年安装在LHC相互作用点5的CMS探测器使用$\sqrt{s} =$ 13 TeV的质子-质子碰撞记录的光度测量。绝对光度标度是使用光束分离扫描(van der Meer方法)测量单个束团交叉的,2015年和2016年的相对精度分别为1.3%和1.0%。不确定性的主要来源与测量的束流位置和LHC磁体的操作设置所提供的束流位置之间的残余差异有关,在横向于束流方向的坐标中的质子束空间密度函数的可因子化性,以及碰撞束流中质子之间的电磁相互作用的影响的建模。当将van der Meer校准应用于整个运行周期时,CMS完全运行时的积分亮度在2015年和2016年分别为2.27和36.3 fb $^{-1}$,相对精度分别为1.6%和1.2%。这些是在聚束强子对撞机上最精确的光度测量。

英文摘要:

The measurement of the luminosity recorded by the CMS detector installed at LHC interaction point 5, using proton-proton collisions at $\sqrt{s} =$ 13 TeV in 2015 and 2016, is reported. The absolute luminosity scale is measured for individual bunch crossings using beam-separation scans (the van der Meer method), with a relative precision of 1.3% and 1.0% in 2015 and 2016, respectively. The dominant sources of uncertainty are related to residual differences between the measured beam positions and the ones provided by the operational settings of the LHC magnets, the factorizability of the proton bunch spatial density functions in the coordinates transverse to the beam direction, and the modeling of the effect of electromagnetic interactions among protons in the colliding bunches. When applying the van der Meer calibration to the entire run periods, the integrated luminosities when CMS was fully operational are 2.27 and 36.3 fb$^{-1}$ in 2015 and 2016, with a relative precision of 1.6% and 1.2%, respectively. These are among the most precise luminosity measurements at bunched-beam hadron colliders.

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