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Reduction of PDF uncertainty in the measurement of the weak mixing angle at the ATLAS experiment

Chinese Physics C 2021年第5期45卷 1-18页

作者： Yao Fu Siqi Yang Minghui Liu Liang Han Tie-Jiun Hou Carl Schmidt Chen Wang C-P.Yuan Department of Modem Physics University of Science and Technology of ChinaJinzhai Road 96Hefei 230026China Department of Physics College of SciencesNortheastern UniversityShenyang 110819China Department of Physics and Astronomy Michigan State UniversityEast LansingMI 48823USA

We investigate the parton distribution function(PDF)uncertainty in the measurement of the effective weak mixing angle sin2θ^(l)_(eff)at the CERN Large Hadron Collider(LHC).The PDF-induced uncertainty is large in proton-proton collisions at the LHC due to the dilution *** measurement of the Drell-Yan forward-backward asymmetry(ApB)at the LHC can be used to reduce the PDF uncertainty in the sin2θ^(l)_(eff)***,when including the full mass range of lepton pairs in the AFB data analysis,the correlation between the PDF updating procedure and the sin2θ^(l)_(eff) extraction leads to a sizable bias in the obtained sin2θ^(l)_(eff)*** our studies,we find that the bias can be significantly reduced by removing Drell-Yan events with invariant mass around the Z-pole region,while most of the sensitivity in reducing the PDF uncertainty ***,the lepton charge asymmetry in the^boson events as a function of the rapidity of the charged leptons,A±(ηl),is known to be another observable which can be used to reduce the PDF uncertainty in the sin2θ^(l)_(eff)*** constraint from A±(ηl)is complementary to that from AFB,and thus no bias affects the sin2θ^(l)_(eff)*** studies are performed using the error PDF Updating Method Package(ePump),which is based on Hessian updating *** this article,the CT14HERA2 PDF set is used as an example.

关键词： parton distribution function weak mixing angle hadron collider experiment electroweak

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