大型强子对撞机中顶夸克对的产生  

Production of top Quark pair at the large hadron collider

作　　者：阿布力克木.吐尔孙 沙依甫加马力.达吾来提 ABLIKIMI Tursun;SAYIPJAMAL Dulat

机构地区：[1]新疆大学物理科学与技术学院,新疆乌鲁木齐830046

出　　处：《浙江大学学报（理学版）》2018年第6期702-706,共5页Journal of Zhejiang University（Science Edition）

基　　金：国家自然科学基金资助项目(11465018)

摘　　要：通过分析质心能量为8TeV的质子-质子对撞实验,对大型强子对撞机上的ATLAS探测器,测量了顶夸克对产生过程pp→tt的归一化微分散射截面,该实验数据对胶子部分子分布函数的确定非常重要.采用蒙特卡罗数值计算程序MadGraph以及CT10NNLO和CT14NNLO部分子分布函数,分别计算此过程的归一化微分散射截面,得到了与ATLAS实验相符的结果.进一步,用ATLAS实验数据和本文的理论计算结果,更新CT14NNLO部分子分布函数.结果显示,顶夸克对归一化微分散射截面对部分子分布函数不敏感.理论计算结果与ATLAS实验测量结果在误差范围内相符,该过程胶子部分子分布函数无明显变化.ATLAS detector at the large hadron collider(LHC)measured the cross section of top quark pair production process pp→t t,and provided important experimental data which can help determine the gluon parton distribution function.Motivated by measurements from the ATLAS collaboration at the LHC,we use Monte Carlo numerical program MadGraph to calculate the cross section for t t with CT10NNLO and CT14NNLO parton distribution functions respectively,and compare results with the measurements from ATLAS collaboration.Our theoretical prediction reaches a good agreement with the experimental measurement from ATLAS collaboration.Furthermore,by using the ATLAS top-quark pair invariant mass differential cross-section data and our theory prediction,we have updated the CT14NNLO PDFs,and find that the ATLAS invariant mass distribution data does not have impact on the gluon parton distribution functions.

关 键 词：顶夸克对产生 散射截面 部分子分布函数 

分 类 号：O572.2[理学—粒子物理与原子核物理]