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.

该提案要求支持最高实验室能量的实验基本粒子物理学研究计划。 这两个强子对撞机实验是费米实验室 Tevatron 的 CDF 和目前在瑞士日内瓦 CERN 实验室建造的大型强子对撞机 (LHC) 的 CMS。 CDF 合作目前正在完成对带有主注入器的高光度数据采集探测器（运行 II）的重大升级，目前计划于 2001 年 3 月 1 日开始。Tevatron 能量将从 1.8 GeV 增加到 2.0 GeV，并且预计光度将增加一个数量级。 约翰·霍普金斯大学的物理学家正在分析当前的数据集（顶夸克的发现正是基于这些数据集），同时也在升级 CDF 粒子跟踪系统的硅顶点探测器 (SVX II) 部分方面发挥着关键作用。 该顶点探测器对于所有带电粒子跟踪都很重要，但对于查找和测量接近主顶点的次要顶点（b 夸克衰变的特征）也至关重要。 该小组在 CDF 的物理研究集中在重夸克物理和寻找新粒子，特别是 b 夸克衰变中的混合和 CP 破坏以及希格斯粒子和超对称性搜索。 CMS 实验将是大型强子对撞机的两项综合实验之一。 它将在寻找标准模型之外的物理学方面开辟新的能源前沿，特别是希格斯玻色子和已知粒子的超对称伙伴。 许多新过程都涉及 b 夸克态。 该小组正在致力于开发 CMS 的 b 夸克顶点探测器功能。 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。 该小组在硅探测器的许多实验（Mark II、SDC、CDF 和 L3）方面拥有十多年的经验。 该小组打算将其物理分析工作集中在利用 b 夸克衰变来研究底物理和顶物理，并寻找电弱对称性破缺、希格斯玻色子和超对称性等现象。L3 实验现在正在获取 W+ 以上的 LEP II 数据。 W-阈值，允许精确测量W玻色子特性，尤其是质量和耦合，并允许搜索新粒子，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（预计在 2000 年秋季），并打算在 2001 年中后期完成 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签名。