The Belle II Project

贝尔二号项目

• 批准号: SAPPJ-2016-00021-2
• 负责人: Robertson, Steven
• 金额: $ 6.44万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=616825
• 关键词: Belle; II; Project

The Belle II experiment will be located at the SuperKEKB e+e- collider at the KEK laboratory in Tsukuba, Japan. It is a successor to the successful Belle and BaBar experiments, which were cited for their contributions to the phenomenon of CP violation in the 2008 Physics Nobel Prize. The primary physics goal of Belle II is to search for evidence of new physics through a wide range of measurements that are sensitive to the presence of heavy virtual particles, and that can be precisely predicted in the Standard Model. These measurements could include CP violation and other asymmetries, rare decays, or forbidden decays. The mass reach of these measurements can exceed that of the direct searches by ATLAS and CMS. If new physics is found at the LHC, Belle II can explore its nature by looking for a pattern of deviations from the Standard Model. Belle II will also be sensitive to the direct production of new light particles, including those predicted by dark sector models of dark matter, or additional Higgs particles, particles that will be difficult to detect at the LHC. The experiment will also continue the exploration of the weak force and CP violation, a program successfully followed by BaBar and Belle. The number of possible measurements can be estimated by the 550 publications produced so far by BaBar. The Canadian Belle II group is preparing for the start of collisions in 2017 and data taking with the complete detector in 2018. Data taking will continue to 2024. Canada has two significant software/operational responsibilities in the calorimeter group: calibration and the GEANT simulation. Calibration will be a multi-year multi-person effort, starting now and extending throughout the project. Canada is also responsible for determining the distribution of detector material in simulation and in reality. A precise understanding of the material is an essential component in minimizing systematic errors, which become increasingly important in light of the high statistics to be collected. The group is responsible for predicting and monitoring beam backgrounds in the calorimeter, and providing the background levels in real time to the accelerator operators. Canadians are leading the low-multiplicity physics effort, which includes tau physics, direct searches for new particles, and electroweak measurements. Computing is an essential component of the experiment, with data sets approaching the size of LHC experiments. Canada is a key contributor of computing resources for the current generation of simulated events, and is developing the tools that will allow Belle II to fully utilize cloud computing. The group is requesting funds to support graduate students and postdocs to undertake the Canadian responsibilities and to produce physics results; for travel primarily to KEK, but also for conferences; material and supplies, including desktop and laptop computing; and common fund.

贝儿II实验将位于日本筑波的KEK实验室的SuperKEKB e+电子对撞机上。它是成功的贝儿和BaBar实验的继承者，这两个实验因其对CP破坏现象的贡献而获得2008年诺贝尔物理学奖。贝儿II的主要物理学目标是通过对重虚粒子存在敏感的广泛测量来寻找新物理学的证据，并且可以在标准模型中精确预测。这些测量可以包括CP破坏和其他不对称性，罕见衰变或禁止衰变。这些测量的质量范围可以超过ATLAS和CMS的直接搜索。如果在大型强子对撞机上发现了新的物理学，贝儿二号就可以通过寻找偏离标准模型的模式来探索它的本质。贝儿II还将对新的光粒子的直接产生敏感，包括暗物质的暗扇区模型预测的那些粒子，或额外的希格斯粒子，这些粒子将难以在大型强子对撞机上检测到。该实验还将继续探索弱力和CP破坏，这是BaBar和贝儿成功遵循的计划。可能的测量数量可以通过BaBar迄今为止发表的550篇出版物来估计。加拿大的贝儿二号小组正在为2017年开始的碰撞和2018年完整探测器的数据采集做准备。数据采集将持续到2024年。加拿大在热量计组中有两个重要的软件/操作责任：校准和GEANT模拟。校准将是一个多年的多人的努力，从现在开始，并在整个项目延伸。加拿大还负责确定探测器材料在模拟和实际中的分布情况。准确理解材料是尽量减少系统误差的一个重要组成部分，鉴于需要收集大量统计数据，系统误差变得越来越重要。该小组负责预测和监测量热计中的束流背景，并将真实的背景水平提供给加速器操作员。加拿大人正在领导低多重性物理学的工作，其中包括tau物理学，直接寻找新粒子和电弱测量。计算是实验的重要组成部分，数据集接近LHC实验的规模。加拿大是当前这一代模拟活动计算资源的主要贡献者，并正在开发工具，使贝儿II能够充分利用云计算。该小组要求提供资金，以支持研究生和博士后承担加拿大的责任并产生物理学成果;主要用于前往科索沃能源公司的旅费，但也用于参加会议;材料和用品，包括台式和膝上型计算机;以及共同基金。