Bridging grant application for ATLAS-Canada; Prompt and Long-Lived Particles - Searching for new physics at the Energy Frontier

加拿大 ATLAS 过渡补助金申请；

• 批准号: SAPPJ-2020-00024
• 负责人: Danninger, Matthias
• 金额: $ 8.74万
• 依托单位: Simon Fraser University
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=741708
• 关键词: Bridging; grant; application; ATLAS; Canada

The proposed research program will act as a bridge to my participation in the ATLAS experiment at the Large Hadron Collider (LHC) at CERN. As a new faculty member in Canada at Simon Fraser University, this initial NSERC Discovery Grant will fund the initiation of my new research program, which will then continue with funding made available by a renewal of the NSERC ATLAS-Canada project grant during the 2021 competition. This application describes the program that I will initiate during this year (request for one year) and that I expect to carry out within the next five years. These funds will allow me to establish an outstanding research program, address imminent challenges ahead of the next LHC data taking period (starting 2021), and enhance Canada's role in one of the world's most highly regarded scientific endeavors. The Standard Model is like Newtonian physics - a success story: it describes all visible matter in the Universe and all forces (with the exception of gravity), and it describes how elementary particles acquire a mass (Higgs mechanism). All predictions have been verified by experiment with excellent precision for more than 50 years. The last piece to this puzzle was added in 2012: the Higgs boson discovery by the ATLAS and CMS experiments. Now we test the limits of this SM in order to find an inconsistency and ascertain clues about physics Beyond the Standard Model (BSM). One promising way to reveal such clues is to push to high energies, where we expect a new theory to reveal itself. The LHC is the most powerful particle accelerator ever built and provides a unique opportunity to explore this high-energy frontier. My primary objective here will be to use the ATLAS detector to search for signs of long-lived new particle (LLP) signatures in order to shed light on the universe's biggest remaining mysteries: why matter prevailed over antimatter in the early universe and what dark matter is. Searching for these particles is highly challenging, as they tend not to interact with other matter, making them elusive to detection. The overwhelming majority of searches for new physics at the LHC have been performed under the assumption that the new particles decay promptly, i.e., very close to the proton-proton interaction point. However, particles in the SM have lifetimes (t) spanning an enormous range of magnitude, from the Z boson (t~10-25s) through to the proton (t>1034y) and electron (stable). Similarly, BSM models typically predict new particles with a variety of lifetimes. BSM LLPs may have macroscopic, detectable displacements between their production and decay points within the detector. Their unusual signatures offer excellent prospects for the discovery of new physics at particle colliders during the next data-taking period. At the same time, standard reconstruction algorithms may reject events or objects containing LLPs precisely because of their unusual nature, and dedicated searches are needed to uncover LLP signals.

拟议的研究计划将充当我参加CERN大型强子对撞机（LHC）Atlas实验的桥梁。作为西蒙·弗雷泽大学（Simon Fraser University）加拿大的一名新教师，这项最初的NSERC Discovery Grant将资助我的新研究计划的启动，然后将继续由NSERC ATLAS-CANADA Project Renewal提供的资金在2021年竞赛期间提供。该申请描述了我今年将启动的计划（请求一年），我希望在未来五年内执行。这些资金将使我能够建立杰出的研究计划，以应对下一个LHC数据摄入期（从2021年开始）提出迫在眉睫的挑战，并增强了加拿大在世界上最受欢迎的科学努力之一中的作用。标准模型就像牛顿物理学一样 - 一个成功的故事：它描述了宇宙中的所有可见物质和所有力（重力除外），它描述了基本粒子如何获得质量（Higgs机制）。所有预测均已通过实验验证，具有出色的精度超过50年。该难题的最后一块是在2012年添加的：Atlas和CMS实验的Higgs玻色子发现。 现在，我们测试此SM的限制，以便找到超出标准模型（BSM）的物理学的不一致的线索。揭示此类线索的一种有希望的方法是推动高能量，我们希望在这里展现出一种新的理论。 LHC是有史以来最强大的粒子加速器，并提供了一个独特的机会来探索这种高能边界。我的主要目的是使用Atlas检测器来寻找长寿新粒子（LLP）签名的迹象，以便揭示宇宙最大的剩余谜团：为什么物质在早期的宇宙中胜过反物质，而暗物质是什么。搜索这些粒子是高度挑战的，因为它们倾向于与其他物质相互作用，因此难以捉摸地被发现。 在LHC上对新物理学的绝大多数搜索是在新粒子迅速衰减（即非常接近质子 - 蛋白质相互作用点）的假设下进行的。然而，SM中的颗粒具有寿命（t），跨越了巨大范围，从Z玻色子（T〜10-25s）到质子（t> 1034Y）和电子（稳定）。同样，BSM模型通常预测具有多种寿命的新粒子。 BSM LLP可能在检测器内的生产和衰减点之间具有宏观检测的位移。他们的不寻常签名为在下一个数据摄入期间在粒子围栏中发现新物理的前景提供了极好的前景。同时，标准重建算法可能会拒绝事件或包含LLP的对象，因为它们的异常性质，并且需要专门的搜索来揭示LLP信号。