Studies of Elementary Particles

基本粒子的研究

• 批准号: 0071001
• 负责人: Morris Swartz
• 金额: $ 201.08万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0071001&HistoricalAwards=false
• 关键词: Studies; Elementary; Particles

This proposal requests support for a research programin experimental elementary particle physics at the highest laboratory energies. The two hadron collider experiments are CDF at the Fermilab Tevatron and CMS at the Large Hadron Collider (LHC) currently being built at the CERN laboratory in Geneva Switzerland. The CDF collaboration is now finishing a major upgrade of the detector for high-luminosity data taking (Run II) with the Main Injector, currently scheduled to begin on 1 March 2001. The Tevatron energy will increase from 1.8 GeV to 2.0 GeV, and the luminosity is expected to increase by an order of magnitude. Johns Hopkins University physicists are analyzing the present data set (from which the discovery of the top quark was made) while also playing crucial roles in upgrading the silicon vertex detector (SVX II) section of the CDF particle tracking system. This vertex detector is important for all charged particle tracking but is essential to find and measure secondary vertices close to the primary vertex that are characteristic of b-quark decays. Physics research in CDF by this group is concentrated on heavy quark physics and searches for new particles, especially mixing and CP-violation in b-quark decays and Higgs and supersymmetry searches. The CMS experiment will be one of two comprehensive experiments at the LHC. It will open a new energy frontier in the search for physics beyond the Standard Model, in particular the Higgs boson and supersymmetric partners of the known particles. Many of the new processes involve states with b-quarks. This group is working to develop the b-quark vertex detector capabilities of CMS. The vertex detector will use small silicon pixels to provide exceptional position resolution near the pp interaction region. This group has over a decade of experience on silicon detectors from many experiments (Mark II, SDC, CDF, and L3). The group intends its physics analysis efforts to be concentrated on using b-quark decays to study bottom and top physics and to search for phenomena on electroweak symmetry breaking, Higgs bosons, and supersymmetry.The L3 experiment is now taking LEP II data above theW+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.

该提案要求在最高实验室能量的实验基本粒子物理学中支持研究计划。 两个强子对撞机的实验是在Fermilab Tevatron和CMS的CDF，目前正在瑞士日内瓦的CERN实验室建造的大型强子对撞机（LHC）。 CDF合作现在正在完成对探测器的重大升级，用于使用主要喷油器进行高光度数据的数据获取（RUN II），目前原定于2001年3月1日开始。TevatronEnergy将从1.8 GEV增加到2.0 GEV，预计亮度将增加数量级。 约翰·霍普金斯大学（Johns Hopkins）的物理学家正在分析当前的数据集（从中发现了最高夸克），同时还在升级CDF粒子跟踪系统的硅顶点检测器（SVX II）部分中发挥了关键作用。 该顶点检测器对于所有带电的粒子跟踪都很重要，但对于发现和测量接近主要顶点的次级顶点至关重要，这是B Quark衰变特征的。 该组在CDF中的物理研究集中在重夸克物理学上，并寻找新粒子，尤其是B Quark衰变中的混合和CP侵略，Higgs和Higgs和Supersymmetraly搜索。 CMS实验将是LHC的两个综合实验之一。 它将在搜索标准模型以外的物理学方面打开一个新的能量边界，尤其是希格斯玻色子和已知颗粒的超对称伴侣。 许多新过程都涉及具有B Quarks的州。 该小组正在努力开发CMS的B Quark顶点检测器功能。 顶点检测器将使用小硅像素在PP相互作用区域附近提供出色的位置分辨率。 该组在许多实验（Mark II，SDC，CDF和L3）上具有十多年的硅探测器经验。 The group intends its physics analysis efforts to be concentrated on using b-quark decays to study bottom and top physics and to search for phenomena on electroweak symmetry breaking, Higgs bosons, and supersymmetry.The L3 experiment is now taking LEP II data above theW+W- threshold, allowing precise measurement of W boson properties, most notably in mass and couplings, and allowing searches for new颗粒，尤其是标准模型和超对称性的希格斯玻色子。 该小组打算继续参与L3数据结束（预计将是2000年秋季），并打算在2001年中期至下半年完成L3分析工作。该组将集中精力搜索Higgs Boson，探索标准模型和SuperSymmpertrymempricricsimatures。