Explorations of the Universe with the BABAR and LSST Experiments

该奖项使由首席研究员Patricia Burchat领导的斯坦福大学团队能够最大限度地实现其在SLAC的BABAR实验投资的长期效益，并通过拟议的大型天气观测望远镜(LSST)为观测宇宙学的新努力做出贡献。该项目的智力价值来自于寻找改进粒子物理标准模型(SM)的方法。SM没有解决“等级”问题，它的粒子内容也不包含宇宙中暗物质的候选者。B工厂对Bottom、Charm和Tau衰变进行了高度敏感的搜索和精确度研究，对为解决SM缺陷而推出的任何模型都施加了严格的限制。斯坦福大学团队将对最终的BABA数据样本进行分析，这将留下一系列结果，这些结果将有助于定义描述宇宙的理论。斯坦福大学的研究小组将完成对稀有或禁忌魔咒和B衰变中新物理的持续搜索，对B-Rho-pi进行最终的随时间变化的Dalitz图分析以提取CKM角α，开始研究以阐明最近观察到但令人困惑的类Charmoni态的性质，并继续在组织生产模拟数据样本方面发挥重要作用，这些数据样本是在巴布尔进行所有物理分析所需的。基于LSST的计划的启动将使该小组能够将引力透镜作为一个宇宙学探测器来研究，它对宇宙中的所有物质-重子物质和暗物质-都很敏感。斯坦福小组一直专注于LSST前的天文数据集(特别是来自8米斯巴鲁望远镜的深部星系团的图像)，以获得引力透镜分析所需的“流水线”开发方面的技术经验，特别是光度学和星系形状的测量，以及与可能限制LSST对宇宙学的敏感性的系统不确定性有关的研究。更广泛的影响包括参与与数据保存和高能物理长期分析有关的问题的实验间研究，特别是针对BABAR数据集。作为这项努力的一部分，斯坦福大学的团队正专注于如何优化长期数据存储和访问，以便扩大范围和进行教育，从而造福于普通公众、高中生和教师、大学水平粒子物理课程的学生，以及未来粒子物理研究生的培训。原型格式和教程正在设计和开发中，并将在PI教授的粒子物理课程中进行测试。此外，将继续开展旨在增加接受物理教育的学生群体并使之多样化的活动。

This award enables the Stanford University group led by Principle Investigator Patricia Burchat to maximize the long-term benefit of its investment in the BABAR experiment at SLAC and contribute to a new effort in observational cosmology through the proposed Large Synoptic Survey Telescope (LSST). The intellectual merit of the project follows from searching for ways to improve the Standard Model (SM) of particle physics. The SM does not address the "hierarchy" problem and its particle content does not contain a candidate for the dark matter in the Universe. The highly sensitive searches and precision studies conducted with bottom, charm and tau decays at the B Factories impose severe constraints on any model that is introduced to address the deficiencies of the SM. The analyses that will be conducted by the Stanford group on the final BABAR data sample will leave a legacy of results that will help define the theories that are developed to describe the universe. The Stanford group will complete ongoing searches for new physics in rare or forbidden charm and B decays, conduct the final time-dependent Dalitz-plot analysis of B - rho-pi to extract the CKM angle alpha, begin studies to elucidate the nature of recently observed but perplexing charmonium-like states, and continue to play a significant role in organizing the production of the simulated data samples needed to carry out all physics analyses in BABAR. The initiation of a program based on the LSST will enable the group to study gravitational lensing as a cosmological probe which is sensitive to all matter in the universe - baryonic and dark matter. The Stanford group has been focusing on pre-LSST astronomical data sets (in particular, images of deep galaxy clusters from the 8-meter Subaru telescope) to gain technical experience in "pipeline" development needed for analysis of gravitational lensing, especially photometry and the measurement of galaxy shapes, and studies related to systematic uncertainties that will potentially limit the sensitivity of LSST for cosmology. Broader impacts include participation in an inter-experiment study of issues related to data preservation and long-term analysis in high energy physics, particularly directed to the BaBar data set. As part of this effort, the Stanford group is focusing on how long-term data storage and access can be optimized for outreach and education to benefit the general public, high school students and teachers, students in college-level particle physics courses, and the training of future graduate students in particle physics. Prototype formats and tutorials are being designed and developed, and will be tested in a particle physics course taught by the PI. In addition, activities aimed at increasing and diversifying the cohort of students who receive a physics education will continue.