Beyond the Standard Model Physics

超越标准模型物理

• 批准号: 1509257
• 负责人: Henry Lubatti
• 金额: $ 249万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-15 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1509257&HistoricalAwards=false
• 关键词: Beyond; Standard; Model; Physics

This award will provide support to a group of three PI's and an experienced senior faculty associate to work on the ATLAS experiment at the Large Hadron Collider (LHC) at CERN, a particle physics laboratory in Geneva, Switzerland. The LHC machine and ATLAS, a large particle detector facility, were built as basic science tools using funds from NSF and other agencies around the world. One of their primary objectives was to find the Higgs Boson, the last particle in the historically successful "Standard Model" (SM) that accounts for so much of the existence of, and forces between, known particles forming the matter in the universe. This effort has been successful. The next step in the experiments is to look for evidence for physics Beyond the Standard Model (BSM) that might, for instance, account for the presence of the mysterious "Dark Matter" that makes up so much of the mass of the universe. The LHC is about to begin run 2 at almost twice the energy ever explored in detail before. It is possible that particles from BSM could materialize at the higher energy. Two Higgs decay types, whose observation relies on techniques developed by this group, could provide the key to seeing BSM for the first time. The investigators will continue to train their algorithms to search for decays of heavy neutral Higgs Bosons into tau+tau- lepton pairs. New algorithms will also be developed to compute the tau pair invariant mass (with two missing neutrinos). They will also search for long lived states seen to emanate from displaced vertices. The long-lived particle search will explore the use of boosted decision trees (BDT) to improve event selection sensitivity and ways of combining events in which the decays occur in ATLAS subsystems. The group also has a number of well-defined service roles in the overall operation of ATLAS, including maintenance of the muon system software, database and data quality. They also work in the development of the new inner pixel detector, part of the phase 2 upgrade program. The group supports a vigorous broader impact program through public dissemination of the results from ATLAS. They also focus on training under represented students. One of the PI's (Goussiou) is also a Co-PI in the NSF QuarkNet outreach program.

该奖项将支持一个由三名PI和一名经验丰富的高级教员组成的小组，在瑞士日内瓦粒子物理实验室CERN的大型强子对撞机(LHC)上从事ATLAS实验。大型强子对撞机和大型粒子探测器ATLAS是利用美国国家科学基金会和世界各地其他机构的资金作为基础科学工具建造的。他们的主要目标之一是找到希格斯玻色子，这是历史上成功的“标准模型”(SM)中的最后一个粒子，它解释了宇宙中形成物质的已知粒子的存在和相互间的作用力。这一努力取得了成功。实验的下一步是寻找标准模型(BSM)以外的物理学证据，例如，可以解释神秘的“暗物质”的存在，这种物质构成了宇宙的如此大的质量。大型强子对撞机即将开始第二次运行，其能量几乎是之前详细探索过的能量的两倍。BSM的粒子有可能在更高的能量下物化。两种希格斯衰变类型，它们的观测依赖于该小组开发的技术，可能会为首次看到BSM提供关键。研究人员将继续训练他们的算法，以搜索成tau+tau-轻子对的重中性希格斯玻色子的衰变。还将开发新的算法来计算tau对不变质量(包括两个丢失的中微子)。他们还将搜索被认为是从移位的顶点发出的长寿命状态。长寿命粒子搜索将探索使用增强型决策树(BDT)来提高事件选择的敏感度，以及组合ATLAS子系统中发生衰变的事件的方法。该小组还在ATLAS的总体运作中扮演一些明确的服务角色，包括维护MUON系统软件、数据库和数据质量。他们还致力于开发新的内部像素探测器，这是第二阶段升级计划的一部分。该组织通过公开传播ATLAS的结果，支持一个强有力的更广泛的影响计划。他们还专注于培训有代表性的学生。其中一名PI(Goussiou)也是NSF QuarkNet外联计划的联合PI。