Electron-Positron Collider Physics

该提案要求支持密歇根大学小组继续在欧洲核子研究中心LEP对撞机上进行L3实验的研究计划，并增加研究和开发工作，为新的高能电子-正电子线性对撞机（LC）做准备。L3实验目前正在获取高于W+W-阈值的LEP II数据，从而能够精确测量W玻色子的性质，特别是质量和耦合，并允许寻找新的粒子，特别是标准模型和超对称中的希格斯玻色子。 该小组打算继续参与L3数据采集，直至LEP运行结束（预计2000年秋季），并打算在2001年中至年底完成L3分析工作。 该小组将集中精力寻找希格斯玻色子，探索标准模型和超对称特征。目前正在瑞士日内瓦的欧洲核子研究中心实验室建造的大型强子对撞机（LHC）之后，世界上下一个主要加速器的一个主要选择是碰撞能量等于或大于500 GeV的电子-正电子线性对撞机。 这将是LEP II完成后轻子对撞机的自然下一步。 该小组自1995年以来一直在液晶物理学和探测器研究中发挥领导作用，并计划在未来几年内大幅增加其努力。 特别是，他们专注于研发的LC检测器跟踪系统。 最初的工作集中在确定希格斯粒子搜索对跟踪器设计的物理要求。 以后的工作将转向研发符合这些要求的跟踪器

This proposal requests support to continue the University of Michigan group's ongoing research program on the L3 experiment at the CERN LEP collider and to increase the research and development effort in preparation for a new high-energy electron-positron linear collider (LC).The L3 experiment is now taking LEP II data above the W+W- threshold, allowing precise measurement of W boson properties, most notably in mass and couplings, and allowing searches for new particles, especially the Higgs boson in both the Standard Model and supersymmetry. The group intends to continue to participate in L3 data taking through the end of LEP running (expected to be fall 2000) and intends to complete L3 analysis work in mid to late 2001. This group will concentrate on the search for the Higgs boson, exploring both Standard Model and supersymmetric signatures.One leading option for the next major accelerator in the world after the Large Hadron Collider (LHC) currently being built at the CERN laboratory in Geneva, Switzerland is an electron-positron linear collider with a collision energy equal to or greater than 500 GeV. This would be a natural next step in lepton colliders after LEP II completion. This group has taken leadership roles in LC physics and detector studies since 1995 and plans to increase its efforts substantially in the coming years. In particular, they are focussed on R&D for an LC detector tracking system. Initial work is concentrated on determining the physics requirements of the Higgs search on tracker design. Later work will shift towards R&D on a tracker that meets these requirements