LHCb 7 TeV W和Z数据对CT14HERA2 PDFs的影响  

The impact of LHCb 7 TeV W and Z data on CT14HERA2 PDFs

作　　者：范红豪 沙依甫加马力·达吾来提[1] 王剑华 阿卜杜伍普尔·阿布力米提 FAN Honghao;SAYIPJAMAL Dulat;WANG Jianhua;ABDUGHUPUR Ablimit(College of Physical Science and Technology,Xinjiang University,Urumqi 830046,China;School of Physics and Telecommunications Engineering,Shaanxi University of Technology,Hanzhong 723000,China)

机构地区：[1]新疆大学物理科学与技术学院,新疆维吾尔自治区乌鲁木齐830046 [2]陕西理工大学物理与电信工程学院,陕西汉中723000

出　　处：《西安邮电大学学报》2022年第3期61-68,共8页Journal of Xi’an University of Posts and Telecommunications

基　　金：国家自然科学基金项目(11965020)。

摘　　要：为了研究LHCb 7 TeV W+、W-和Z实验数据对CT14HERA2部分子分布函数(Parton Distribution Functions,PDFs)的影响,首先将收集到的数据进行了理论预测并将其和实验测量结果进行了比较,在误差允许的范围内理论和实验符合的很好。其次,用误差PDFs更新软件包(Error PDFs Updated Method Package,EPUMP)更新了CT14HERA2 PDFs,并和全局拟合的PDFs进行了比较。最后,加入协方差矩阵后的实验数据可以在较大和较小的x区域减少d(x,Q)/u(x,Q)误差,同时也对CT14HERA2 PDFs进行了优化。验证结果表明,LHCb 7 TeV W+、W-和Z产生的实验数据在较大的x区域对g(x,Q)、d(x,Q)、d(x,Q)/u(x,Q)、d(x,Q)/u(x,Q)、u(x,Q)、d(x,Q)和u(x,Q)PDFs的中心值约束较大,可以用前4个误差PDFs代替原来全局拟合或优化后得到的56个误差集。In order to study the impact of LHCb 7 TeV W+,W-and Z experimental data on the CT14HERA2 parton distribution functions(PDFs),the data are predicted theoretically and compared with the experimental measurement results.The results show that the theoretical and experimental results agree well within the allowable range of error.Secondly,the error PDFs updating method package(ePump)is adopted to update CT14HERA2 PDFs,and it is compared with the global fitting PDFs.Finally,the experimental data added with the covariance matrix can reduce the d(x,Q)\/u(x,Q)error in a larger and smaller x region,and the CT14HERA2 PDFs is optimized.It shows that W^(+),W^(-) and Z production from LHCb at 7 TeV have a large constraint on the center value of g(x,Q),d(x,Q),d(x,Q)/u(x,Q),(x,Q)、d(x,Q)、d(x,Q)/u(x,Q)、d(x,Q)/u(x,Q)、u(x,Q)、d(x,Q) and u(x,Q)PDFs in the larger x region.The 56 error sets obtained by the global fitting or optimization can be replaced by the first 4 reduced error PDFs.

关 键 词：部分子分布函数 W玻色子 Z玻色子 误差PDFs更新软件包 散射截面 微分散射截面 

分 类 号：O572.2[理学—粒子物理与原子核物理]