Heavy Quark Physics at Babar

巴巴尔的重夸克物理

• 批准号: 0457336
• 负责人: Michael Sokoloff
• 金额: --
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-04-15 至 2009-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0457336&HistoricalAwards=false
• 关键词: Heavy; Quark; Physics; Babar

Funds are requested to support the research of two professors at the University of Cincinnati. The research effort is concentrated at the Stanford Linear Accelerator Center (SLAC) and makes use of the BaBar detector facility. The BaBar detector was built by a large international collaboration including the PIs and has been in continuous use for the past five years. The principal scientific goal of the BaBar experiment is the study of CP violation, an important ingredient in the particle-antiparticle asymmetry of the universe, and its relationship with the Standard Model (SM) describing interactions between elementary particles. In particular, the SM predicts that measurement of various decays of B mesons can be related through the 3x3 Cabbibo-Kobayaski-Maskawa (CKM) matrix. The phases in this matrix are related through a unitarity triangle whose three angles, alpha, beta, and gamma, should sum to 180 degrees. The BaBar experiment uses the PEP2 accelerator at SLAC, which was designed to provide a large number of B mesons. The high B meson flux makes it possible to examine many rare decay modes that are suitable for measurement of each of the mixing angles. The experiment has also produced other interesting physics results, including the surprising discovery of new strange, charmed mesons (DsJ ) with unusual properties. The PIs were directly involved in this discovery. The Cincinnati group proposes to carry out analyses aimed at measurement of the angle, gamma, and at other investigations of importance in the study of B and D mesons and other heavy quark systems. These studies will include a search for phenomena such as mixing in the neutral D system that may involve physics beyond the SM. The BaBar experiment runs in a so-called factory mode, which is a requirement for producing the large number of B mesons needed. This mode of running mandates that all members of each university group work on significant service tasks. The Cincinnati group works largely on the DIRC - a novel particle identification device. Both BaBar and PEP2 are working well. PEP2 is running at levels that significantly exceed its design specifications.In its broader impacts, this proposal will contribute to the education of the students and postdoctoral associates in the Cincinnati group. They are exposed to a great deal of up-to-date technology, in addition to being trained in a closely watched environment in elementary particle physics. Based at SLAC, their efforts are on view to a large community of important physicists who are found there. They become highly skilled in computing in various environments, in the diagnosis of electronic and mechanical systems, and in presentation of results and ideas in the almost daily meetings required of a large collaboration.

请拨资金支持辛辛那提大学两位教授的研究。研究工作集中在斯坦福直线加速器中心（SLAC），并利用BaBar探测器设施。BaBar探测器是由包括pi在内的大型国际合作建造的，在过去的五年里一直在持续使用。BaBar实验的主要科学目标是研究CP违背（宇宙中粒子-反粒子不对称的一个重要组成部分）及其与描述基本粒子之间相互作用的标准模型（SM）的关系。特别是，SM预测了B介子的各种衰变的测量可以通过3x3 Cabbibo-Kobayaski-Maskawa （CKM）矩阵联系起来。这个矩阵中的相位是通过一个统一三角形联系起来的，它的三个角，和应该是180度。BaBar实验使用SLAC的PEP2加速器，该加速器旨在提供大量的B介子。高B介子通量使得可以检测许多罕见的衰变模式，这些模式适合于测量每个混合角。该实验还产生了其他有趣的物理结果，包括令人惊讶地发现了具有不同寻常性质的新奇异迷人介子（DsJ）。pi直接参与了这一发现。辛辛那提小组建议进行分析，目的是测量角度，伽马，以及在研究B和D介子和其他重夸克系统中其他重要的调查。这些研究将包括寻找中性D系统中的混合等现象，这些现象可能涉及SM之外的物理。BaBar实验在所谓的工厂模式下运行，这是产生大量B介子所需的条件。这种运行模式要求每个大学小组的所有成员都从事重要的服务任务。辛辛那提研究小组主要研究DIRC——一种新型粒子识别装置。BaBar和PEP2都运行良好。PEP2的运行水平大大超过了其设计规格。在其更广泛的影响中，该提案将有助于辛辛那提集团的学生和博士后的教育。除了在严密监视的环境中接受基本粒子物理学的训练外，他们还接触到大量最新的技术。在SLAC的基础上，他们的努力在那里发现了一个重要的物理学家的大社区。他们在各种环境中的计算，电子和机械系统的诊断，以及在大型合作所需的几乎每天的会议中展示结果和想法方面变得非常熟练。