论文标题
了解CT18全球分析中$ W $玻色子质量测量的PDF不确定性
Understanding PDF uncertainty on the $W$ boson mass measurements in CT18 global analysis
论文作者
论文摘要
我们研究了带电的Lepton的横向质量分布以及对Parton分布（PDFS）的缺失能量的依赖性，该分布适用于CDF和ATLAS实验的$ W $ Boson质量测量。我们比较了由不同PDF诱导的分布的形状变化，发现来自不同PDF集的预测的扩散可能比特定PDF集的PDF不确定性大得多。我们建议使用最新PDF分析实验数据，以更好地了解$ W $玻色子质量测量中的PDF不确定性。我们进一步进行了一系列Lagrange乘数扫描，以确定CT18全局分析中各个数据集施加的横向质量分布的约束。在CDF测量的情况下，该分布在中间$ x $区域的$ d $ quark pdfs主要敏感，该$ x $区域在很大程度上受到迪特隆目标的DIS和DRELL-YAN数据的约束，以及Tevatron Lepton Charge Audric Audric bucare Admymetry Admymetry Data。
We study the dependence of the transverse mass distribution of the charged lepton and the missing energies on the parton distributions (PDFs) adapted to the $W$ boson mass measurements at the CDF and ATLAS experiments. We compare the shape variations of the distribution induced by different PDFs and find that spread of predictions from different PDF sets can be much larger than the PDF uncertainty predicted by a specific PDF set. We suggest analyzing the experimental data using up-to-date PDFs for a better understanding of the PDF uncertainties in the $W$ boson mass measurements. We further carry out a series of Lagrange multiplier scans to identify the constraints on the transverse mass distribution imposed by individual data sets in the CT18 global analysis. In the case of CDF measurement, the distribution is mostly sensitive to the $d$-quark PDFs at the intermediate $x$ region that is largely constrained by the DIS and Drell-Yan data on the deuteron target, as well as the Tevatron lepton charge asymmetry data.
