Understanding PDF uncertainty in W boson mass measurements

作     者：高俊 刘殿宇 谢可平 Jun Gao;Dianyu Liu;Keping Xie

作者机构：NPACShanghai Key Laboratory for Particle Physics and CosmologySchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE)Shanghai 200240China Pittsburgh Particle PhysicsAstrophysicsand Cosmology CenterDepartment of Physics and AstronomyUniversity of PittsburghPittsburghPA 15260USA 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2022年第46卷第12期

页      面：179-193页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(11875189 and 11835005) the Yangyang Development Fund supported by the U.S. Department of Energy(DE-SC0007914) National Science Foundation (PHY-2112829) the PITT PACC 

主　　题：W-boson mass PDF uncertainty CT18 

摘      要：We study the dependence of the transverse mass distribution of charged leptons and the missing energy on parton distributions(PDFs)adapted to 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 the spread of predictions from different PDF sets can be significantly larger than the PDF uncertainty predicted by a specific PDF set.We suggest analyzing the experimental data using up-to-date PDFs to gain a better understanding of the PDF uncertainties in W boson mass measurements.We also perform 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 the CDF measurement,the distribution is mostly sensitive to d-quark PDFs in the intermediate x region,which are largely constrained by DIS and Drell-Yan data on deuteron targets and Tevatron lepton charge asymmetry data.