论文标题
对颜色重新连接敏感的可观察到的测量值$ t \ bar {t} $ events the atlas detector at $ \ sqrt {s} = 13 $ tev
Measurements of observables sensitive to colour reconnection in $t\bar{t}$ events with the ATLAS detector at $\sqrt{s}=13$ TeV
论文作者
论文摘要
使用139 $ \，$ tev质子 - proton-proton碰撞数据收集的139 fb $^{ - 1} $对颜色重新连接的影响敏感的观测值对颜色重新连接的影响敏感。选择事件是通过需要一个隔离的电子和一个相反电荷的孤立电子和两个或三个喷气机来选择事件，其中恰好需要两个喷气机为$ b $标记。对于选定的事件，提出了针对带电的粒子多重性，带电粒子的横向动量的标量和的测量值，以及带电粒子多重性的箱中的标量总和相同。这些可观察的物品被展开至稳定的粒子水平，从而纠正了由于有限的检测器的分辨率，接受和效率效应而导致的迁移效应。将粒子水平的测量与蒙特卡洛发生器中的不同颜色重新连接模型进行比较。这些测量值不散发一些颜色重新连接模型，并为蒙特卡洛发生器中参数的未来优化提供了输入。
A measurement of observables sensitive to effects of colour reconnection in top-quark pair-production events is presented using 139 fb$^{-1}$ of 13$\,$TeV proton-proton collision data collected by the ATLAS detector at the LHC. Events are selected by requiring exactly one isolated electron and one isolated muon with opposite charge and two or three jets, where exactly two jets are required to be $b$-tagged. For the selected events, measurements are presented for the charged-particle multiplicity, the scalar sum of the transverse momenta of the charged particles, and the same scalar sum in bins of charged-particle multiplicity. These observables are unfolded to the stable-particle level, thereby correcting for migration effects due to finite detector resolution, acceptance and efficiency effects. The particle-level measurements are compared with different colour reconnection models in Monte Carlo generators. These measurements disfavour some of the colour reconnection models and provide inputs to future optimisation of the parameters in Monte Carlo generators.
