LHCb 7 TeV Drell-Yan-Z数据对部分子分布函数的影响  

Impact of the LHCb 7 TeV Drell-Yan-Z data on parton distribution functions

作　　者：王启荣 阿力木·阿布来提 沙依甫加马力·达吾来提[1] WANG Qi-rong;ALIM Ablat;SAYIPJAMAL Dulat(School of Physical Science and Technology,Xinjiang University,Urumqi 830046,China)

机构地区：[1]新疆大学物理科学与技术学院,乌鲁木齐830046

出　　处：《兰州大学学报(自然科学版)》2025年第2期257-264,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(11965020)。

摘　　要：用ePump快速海森分析技术,研究大型强子对撞机中质心系能量为7 TeV时,LHCb探测器测量Drell-Yan-Z过程的总散射截面和微分散射截面数据对CT18A部分子分布函数(PDF)的影响.利用蒙特卡罗数值计算程序MCFM-8.2和CT18A、 MSHT20、 NNPDF4.0 PDF进行次次领头阶微扰量子色动力学计算得到理论数据,与实验数据进行比较后,证实了大部分数据点的理论结果和实验值一致.用ePump更新CT18A PDF获得CT18A+LHCb7Z PDF,当能量标度Q=100 GeV时,LHCb7Z数据对uˉ和dˉPDF的中心值和误差的影响微弱.用ePump优化更新后的CT18A+LHCb7Z PDF,残差精度为1%时,优化得到的前6对误差PDF可以代替全局拟合的结果.The ePump fast Hessian analysis technique was used to investigate the impact of the total and differential scattering cross-section data of the Drell-Yan-Z process from the LHCb detector at the Large Hadron Collider,with a center-of-mass energy is 7 TeV,on the CT18A parton distribution functions(PDF).Next-to-next-to-leading order in perturbative quantum chromodynamic calculations was performed using Monte Carlo numerical calculation program MCFM-8.2,CT18A,MSHT20 and NNPDF4.0PDF to obtain relevant theoretical data,and compared with the experimental data to confirm the consistency of most data points in theory and experiment.ePump was used to update CT18A PDF to obtain CT18A+LHCb7Z PDF.The results showed that,when the energy scale Q =100 GeV,the LHCb7Z data would change the center values of the uˉ and dˉ PDF.ePump was applied to optimize CT18A+LHCb7Z PDF.When the residual accuracy is 1%,the first six pairs of error PDF obtained after optimization,which could replace the results of global fitting.

关 键 词：部分子分布函数 Drell-Yan-Z过程 散射截面 

分 类 号：O572.2[理学—粒子物理与原子核物理]