Impact Of LHC Drell-Yan Data On PDFs

PDFs are not only the most important part of particle physics,but also indispensable for the collider physics and high-energy physics.there is no theoretical calculation for hadron-hadron and can not understand the structure of the hadron without PDFs.Although in the low-energy level,the current parton distribution functions can be used to determine mass of the elementary particles in standard model,coupling constant,mass of the Higgs boson,mass of the W boson etc,but can not be used to calculate the mass of neutrino problem,Asymmetry of the W boson,and the supersymmetric particle using by PDFs.there will be a phenomenon that the PDFs deviation is greater than the total theoretical value.This is undoubtedly a mistake,so we need a partial sub-distribution function with such high precision.Total and differential cross section for the process pp→Z^*+X→e⁺+e^-+X are measured in pp collision at a center of mass energy of 8 TeV with the LHCb experiment at the LHC,which is important for determining the strange quark parton distribution functions.In this paper,with the same constraints,we first calculated the total and the differential scattering cross section of the process by Monte Carlo numerical simulation tool ResBos with CT14NNLO PDFs,which is in good agreement with the experiment data,then the CT14NNLO PDF is optimized with the Updating and Optimizing Error PDFs tool ePump by this data.The comparison of the optimized PDFs and the original PDFs results shows that the experimental data has a significant effect on the strange quark parton distribution functions when the energy scale Q=1.3 GeV,that is,within the range of 10^-6<x<0.2 PDF uncertainty is significantly reduced,but has no significant effect on it as Q=100GeV.