Beam Background Monitors for the Belle II Experiment

Belle II 实验的光束背景监视器

• 批准号: SAPEQ-2016-00001
• 负责人: Warburton, Andreas
• 金额: $ 4.37万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Research Tools and Instruments
• 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=616786
• 关键词: Beam; Background; Monitors; Belle; II

The Belle II experiment will be located at the SuperKEKB e+e- collider at the KEK laboratory in Tsukuba, Japan. It is the successor to the successful Belle and BaBar experiments, which were cited for their contributions to the phenomenon of CP violation in the 2008 Nobel Prize in Physics. 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 in ways that are not feasible at a hadron collider. If new physics is not discovered at the LHC, Belle II measurements will provide critical guidance towards beyond-the-standard-model theories by either discovering new phenomena and deviations from Standard Model expectations, or by excluding hypothesized models of new physics. 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 funds requested will enable the Canadian group to develop and provide permanent hardware for fast real-time SuperKEKB-beam background monitoring in the vicinity of the Belle II electromagnetic calorimeter. The system will consist of LYSO crystals, which are radiation hard and have fast-timing responses, thereby providing accelerator operators with sensitivity to quickly varying injection backgrounds manifesting in multiple particle types. Longevity of the system's operations over the lifetime of the Belle II experiment's run periods will be achieved by using a set of light guides to permit a single multiplexed photo-multiplication component to provide signal readout in a location with reduced radiation and magnetic-field levels, remote from the background detectors embedded inside the electromagnetic calorimeter's shielding. This research will further worldwide particle-physics knowledge of the fundamental constituents of matter in our Universe. The Canadian designed and built hardware in this request will constitute a part of the Belle II experiment and will provide unique training of highly qualified personnel, individuals with enhanced capacity to contribute to future Canadian knowledge acquisition and economically beneficial innovation in the private and public sectors.

Belle II实验将位于日本Tsukuba的Kek实验室的Superkekb E+collider。它是成功的Belle和Babar实验的继任者，在2008年诺贝尔物理学奖中对CP违规现象的贡献引用了。 Belle II的主要物理目标是通过广泛的测量值搜索新物理学的证据，这些测量值对沉重的虚拟颗粒的存在敏感，并且可以在标准模型中进行精确预测。这些测量可能包括违反CP和其他不对称性，罕见衰减或禁止腐烂。 这些测量值的质量可以超过地图集和CM的直接搜索。如果在LHC上找到新的物理学，Belle II可以通过在强子对撞机上不可行的方式寻找与标准模型的偏差模式来探索其性质。如果未在LHC上发现新物理学，Belle II测量结果将通过发现新现象和与标准模型期望的偏差或排除假设的新物理模型来为超出标准模型理论提供关键指导。 Belle II还将对直接生产新的光颗粒（包括由暗物质的暗区模型预测的颗粒）或其他希格斯颗粒（在LHC上难以检测的颗粒）敏感。该实验还将继续探索弱部队和CP违规行为，该计划随后是Babar和Belle。 所要求的资金将使加拿大集团能够开发和提供永久性的硬件，以在Belle II电磁热量计附近快速实时的Superkekb梁背景监视。该系统将由溶血晶体组成，溶血晶体很难辐射，并具有快速的响应，从而为加速器操作员提供了灵敏度对快速变化在多种粒子类型中表现出的注入背景的敏感性。在Belle II实验的运行期间，该系统操作的寿命将通过使用一组轻度指南来实现，以允许单个多路复用的光电涂层组件在辐射和磁场水平降低的位置提供信号读数，远离背景检测器嵌入了电磁液体内部的固定量表。 这项研究将进一步对我们宇宙中物质基本成分的全球粒子物理学知识。加拿大设计和建造的硬件在本要求中将构成Belle II实验的一部分，并将为高素质的人员，具有增强能力的个人提供独特的培训，可以为未来的加拿大知识获取做出贡献，并在私营部门和公共部门中对经济有益的创新。