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Electroweak Precision Measurements at Hadron Colliders(强子对撞实验上的精确电弱测量)

by Dr. Siqi Yang (The University of Iowa)

Thursday, September 12, 2019 from to (Asia/Shanghai)
at IHEP main building ( C305 )
The electroweak precision measurement is amoung the most important topics in experimental physics. In the past decades, many milestones in particle physics, including the discovery of the W and Z bosons, the top quark and the Higgs boson, benifit from the electroweak precision measurement and corresponding global fitting. From the beginning of this century, electroweak precision measurement has been performed at hadron colliders. After the discovery of the top quark and Higgs boson, it becomes important to help searching the beyond standard model phenomenon (especially for the situation that we did not have clear clue for new physics by direct searching at the LHC). To provide high precision for fundamental parameters in the electroweak theory (the W boson mass and the effective weak mixing angle), multiple topics have to be studied., including one order of magnitude improvement on the lepton reconstruction, better modelling of the PDF and calculation in QCD, and study on the strategy of performing such measurements at high instantaneous luminosity colliders. The reporter will discuss the highlights in the electroweak precision measurement at the Fermilab’s Tevatron, and introduce the current status of measurements at the CERN LHC.

精确电弱测量一直是实验物理最重要的领域之一,其相关研究难度大、周期长。近几十年的重大发现,包括W与Z玻色子、top夸克、Higgs玻色子,都极大受益于精确电弱测量与global fitting对其质量区间的精确预测。从本世纪初开始,精确电弱测量首次迎来高能强子对撞时代。随着top夸克与Higgs的发现,精确电弱测量成为寻找新物理最重要的切入点之一(尤其是至今LHC上的直接新物理寻找并未取得显著线索的情况下)。该领域以关键参数(W玻色子质量与有效弱混合角)测量为物理目标,带领了一系列相关课题方向。实验技术方面,提出了强子实验上电子与缪子重建各个方面的最高精度要求(超越现有精度一个数量级);理论计算方面,要求显著降低PDF与QCD误差;物理测量方面,涉及到系统性的方法设计。报告人介绍近年来在第一代TeV级强子对撞机Tevatron上的精确电弱测量结果和主要突破。并讨论当前LHC上精确电弱测量的进展情况以及对未来的测量规划。