Understanding PDF uncertainty in W boson mass measurements  

作　　者：Jun Gao Dianyu Liu Keping Xie 高俊;刘殿宇;谢可平(NPAC,Shanghai Key Laboratory for Particle Physics and Cosmology,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;Key Laboratory for Particle Astrophysics and Cosmology(MOE),Shanghai 200240,China;Pittsburgh Particle Physics,Astrophysics,and Cosmology Center,Department of Physics and Astronomy,University of Pittsburgh,Pittsburgh,PA 15260,USA)

机构地区：[1]NPAC,Shanghai Key Laboratory for Particle Physics and Cosmology,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China [2]Key Laboratory for Particle Astrophysics and Cosmology(MOE),Shanghai 200240,China [3]Pittsburgh Particle Physics,Astrophysics,and Cosmology Center,Department of Physics and Astronomy,University of Pittsburgh,Pittsburgh,PA 15260,USA

出　　处：《Chinese Physics C》2022年第12期179-193,共15页中国物理C（英文版）

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

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.

关 键 词：W-boson mass PDF uncertainty CT18 

分 类 号：O572.3[理学—粒子物理与原子核物理]