Heavy Quark Physics at Babar

请求提供资金，以支持辛辛那提大学两名教授的研究。研究工作集中在斯坦福大学直线加速器中心（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项目建造的，在过去五年中一直在持续使用。BaBar实验的主要科学目标是研究CP破坏，这是宇宙粒子-反粒子不对称性的重要组成部分，以及它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，各种衰变的B介子的测量可以通过3 × 3 Cabbibo-Kobayaski-Maskawa（CKM）矩阵。该矩阵中的相位通过幺正三角形相关，该幺正三角形的三个角α、β和γ的总和应为180度。BaBar实验使用SLAC的PEP 2加速器，该加速器旨在提供大量的B介子。高的B介子通量使得有可能检查许多罕见的衰变模式，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寻常性质的新的奇怪的魅力介子（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γ，并在研究B和D介子以及其他重夸克系统中进行其他重要的研究。这些研究将包括对中性D系统中可能涉及SM之外的物理的混合等现象的研究。BaBar实验以所谓的工厂模式运行，这是生产大量B介子所需的条件。这种运行模式要求每个大学组的所有成员都从事重要的服务任务。辛辛那提小组主要致力于DIRC --一种新型的颗粒识别装置。BaBar和PEP 2都运行良好。PEP 2的运行水平大大超过了其设计规格。在其更广泛的影响，这一建议将有助于在辛辛那提组的学生和博士后助理的教育。他们接触到大量的最新技术，除了在基本粒子物理学的密切关注的环境中接受培训。基于SLAC，他们的努力是对一个大的社区的重要物理学家谁是在那里发现。他们在各种环境中的计算，电子和机械系统的诊断，以及在几乎每天的会议中展示结果和想法方面都非常熟练。

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.