利用TPX像素器件的命中计数测量13个TeV的LHC质子-质子碰撞的精确亮度
Precision Luminosity of LHC Proton-Proton Collisions at 13 TeV Using Hit-Counting with TPX Pixel Devices
摘要：
安装在ATLAS洞穴中的Timepix（TPX）设备网络作为一个独立的系统测量LHC光度随时间的变化。这些数据来自2015年13 TeV质子-质子碰撞。使用两个TPX装置，对通过像素矩阵的颗粒产生的命中数进行计数。对LHC束的van der Meer扫描进行了分析，使用不同束流轮廓上的束流积分亮度平均值进行近似绝对光度归一化。结果表明，TPX网络具有精确测量LHC光度降低的能力。在四个传感器（每个TPX设备中有两个传感器）之间进行了比较研究，并确定亮度测量的相对短期精度为0.1%，时间间隔为10 s。在数据采集期间，测量值的内部长期时间稳定性低于0.5%。
英文摘要：
A network of Timepix (TPX) devices installed in the ATLAS cavern measures the LHC luminosity as a function of time as a stand-alone system. The data were recorded from 13 TeV proton-proton collisions in 2015. Using two TPX devices, the number of hits created by particles passing the pixel matrices was counted. A van der Meer scan of the LHC beams was analysed using bunch-integrated luminosity averages over the different bunch profiles for an approximate absolute luminosity normalization. It is demonstrated that the TPX network has the capability to measure the reduction of LHC luminosity with precision. Comparative studies were performed among four sensors (two sensors in each TPX device) and the relative short-term precision of the luminosity measurement was determined to be 0.1% for 10 s time intervals. The internal long-term time stability of the measurements was below 0.5% for the data-taking period.
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