Bridging grant application for ATLAS-Canada: Electroweak multi-boson interactions at the Large Hadron Collider

ATLAS-Canada 的过渡拨款申请：大型强子对撞机的电弱多玻色子相互作用

• 批准号: SAPPJ-2021-00023
• 负责人: Russell, Heather
• 金额: $ 2.19万
• 依托单位: University of Victoria
• 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=743119
• 关键词: Bridging; grant; application; ATLAS; Canada

The Standard Model (SM) of particle physics provides the current best description of elementary particles and their interactions. However, there are many phenomena that are outside the scope of the SM. Particle interactions are mediated by four forces: strong, weak, electromagnetic, and gravitational. The strong, weak, and electromagnetic forces are mediated by so-called gauge bosons: gluons, W and Z bosons, and photons, respectively. At the high energies probed in proton-proton collisions at the Large Hadron Collider (LHC) at CERN, the weak and electromagnetic forces are unified into the electroweak force. The LHC allows us to probe the intricate details of electroweak interactions at the highest-ever energy scales with unprecedented precision. Furthermore, the required extensions to the SM to explain dark matter and the matter-antimatter asymmetry of the universe are intimately tied to modifications of SM electroweak interactions, and the LHC provides the richest environment in which to probe these interactions. This grant will enable me to lead a new research programme at the LHC to answer fundamental questions about electroweak interactions. The production of multiple gauge bosons in electroweak interactions in pp collisions is extremely rare but precisely predicted by the SM. As such, any existing multi-boson measurements are currently limited in experimental precision, and our understanding of these processes is markedly limited. It is therefore possible that new physics phenomena that couple to these particles could be revealed through the study of such processes. New particles at the TeV energy scale, out of reach from direct searches at the LHC, can alter the rate or kinematics of multi-boson processes. I will spearhead the effort to perform a combined effective field theory fit of the three measurements that are sensitive to the interaction between two W bosons and two photons. This combination will provide optimal sensitivity to any as-of-yet undiscovered particles, as well as showing any areas where such particles could be hidden from our searches. Identifying these uncovered areas will help inform our future measurements - and preparations for Run 3. Additionally, I will contribute to the ATLAS Trigger software for Run 3 and beyond. I have worked on the trigger since January 2017, and have made significant contributions towards increasing the breadth of signal topologies we recorded in Run 2. In Run 3, the high-level trigger software will run multithreaded, and a significant amount of work is necessary to complete and commission the software. I will work on designing and optimizing the overall event selection for Run 3 to ensure we can maintain the overall high quality of data ATLAS recorded in Runs 1 and 2.

粒子物理的标准模型(SM)提供了当前对基本粒子及其相互作用的最佳描述。然而，有许多现象超出了SM的范围。粒子相互作用受四种力的影响：强力、弱力、电磁力和引力。强、弱和电磁力分别由所谓的规范玻色子：胶子、W玻色子和Z玻色子以及光子来调节。在欧洲核子研究中心(CERN)的大型强子对撞机(LHC)上探测到的高能质子-质子碰撞中，弱力和电磁力被统一为电弱力。大型强子对撞机使我们能够在有史以来最高的能量尺度上以前所未有的精度探测电弱相互作用的复杂细节。此外，解释暗物质和宇宙物质-反物质不对称性所需的SM扩展与SM电弱相互作用的修改密切相关，而大型强子对撞机提供了最丰富的环境来探索这些相互作用。这笔赠款将使我能够在大型强子对撞机上领导一个新的研究计划，回答有关弱电相互作用的基本问题。在pp碰撞的电弱相互作用中产生多个规范玻色子的情况非常罕见，但SM准确地预测了这一点。因此，现有的任何多玻色子测量目前在实验精度上都是有限的，我们对这些过程的理解也明显有限。因此，有可能通过对这些过程的研究来揭示与这些粒子耦合的新的物理现象。在大型强子对撞机上直接搜索不到的TeV能级的新粒子，可以改变多玻色子过程的速率或运动学。我将带头努力执行三种测量的组合有效场理论，这三种测量对两个W玻色子和两个光子之间的相互作用很敏感。这一组合将为任何尚未发现的粒子提供最佳的敏感度，并显示出这些粒子可能隐藏在我们搜索之外的任何区域。确定这些未覆盖的区域将有助于我们未来的测量-以及为第三次测试做准备。此外，我将为第三次测试及以后的ATLAS触发器软件做出贡献。自2017年1月以来，我一直致力于触发器的工作，并为增加我们在第二轮记录的信号拓扑的广度做出了重大贡献。在第三轮，高级触发器软件将以多线程运行，完成和调试该软件需要大量工作。我将致力于设计和优化运行3的整体事件选择，以确保我们可以保持运行1和2中记录的ATLAS的整体高质量数据。