Particle Physics Experimental Consolidated Grant (2019-2022)

曼彻斯特的粒子物理小组研究基本粒子及其相互作用，并在主要的国际研究中心进行实验。这项研究是在国际合作中进行的，涵盖了实验粒子物理学的各个方面：新型探测器概念的发展；大型实验的设计、建设和运行；以及数据分析。粒子物理小组在大型强子对撞机（LHC）的两个主要实验中起着主导作用，LHC可以产生目前加速器中最高能量的质子-质子碰撞。在ATLAS和LHCb实验中，我们以前所未有的精度测试粒子物理标准模型，并寻找超越标准模型的新物理。这些研究包括测量强和电弱相互作用的性质。我们还研究了希格斯玻色子的性质，它最初是在大型强子对撞机上发现的。我们在ATLAS的另一个研究重点是研究所有已知夸克中最重的夸克，即顶夸克的性质，曼彻斯特粒子物理小组在这方面有多年的经验。LHCb实验旨在研究由重底夸克和粲夸克组成的粒子的性质。对它们的产生和衰变的详细研究为新物理学提供了一个窗口，并使我们能够研究诸如物质-反物质不对称的起源等基本问题。我们也在积极准备未来对ATLAS和LHCb实验进行升级，这将使它们的发现范围大大扩大。μ子g-2实验将检查受到磁场作用的μ子的进动。主要目标是通过测量进动率，精确到百万分之0.14，来检验标准模型对这个值的预测。如果存在不一致，则可能表明标准模型是不完整的。Mu2e实验的目标是在不释放中微子的情况下发现介子转化为电子的过程。了解难以捉摸的中微子的性质是我们研究计划的另一个重点。利用位于Modane地下实验室的SuperNEMO探测器，我们寻找中微子双β衰变，这是一个以前从未观察到的过程。它的观测结果将表明，中微子本身就是反粒子，它将提供中微子质量的测量方法。另一种不同的实验，DUNE，将使用一种基于液态氩的新技术来探测从芝加哥费米实验室发送到南达科他州矿井的中微子束。这个实验的目的是了解中微子是否违反了物质和反物质之间的基本对称性。该实验还可以探测到超新星爆炸产生的大量中微子。一个类似的实验（SBND/MicroBooNE）在费米实验室使用靠近源的中微子来寻找“无菌”中微子，这些中微子不通过标准模型的任何基本相互作用来相互作用，除了引力。现代粒子物理学实验包含了探测粒子的复杂技术。曼彻斯特集团领导了一项广泛的研究计划，开发新型检测设备，如三维硅探测器和金刚石探测器。这些新技术在粒子物理研究之外，在医学物理和安全应用等领域有许多潜在的应用。粒子物理实验需要对大型、复杂的数据集进行重建和分析。我们运营着一个大型计算设备，为其中几个大型项目提供数据分析支持。我们开发并应用复杂的分析技术来处理大型数据集。最后，通过我们的外展计划，我们通过媒体、公开讲座和大师班向公众传播我们的研究成果。

The Particle Physics Group at Manchester studies fundamental particles and their interactions, with experiments based at major international research centres. This research is performed in international collaborations and covers all aspects of experimental particle physics: the development of novel detector concepts; the design, construction and operation of large experiments; and the analysis of data.The Particle Physics Group plays a leading role on two of the main experiments at tbe Large Hadron Collider (LHC), which produces proton-proton collisions at the highest energies currently accessible in accelerators. On the ATLAS and LHCb experiments, we test the Standard Model of Particle Physics with unprecedented precision and search for new physics beyond the Standard Model. These studies include measurements of the properties of the strong and electroweak interactions. We also study the properties of the Higgs boson, which was originally discovered at the LHC. Another focus of our research at ATLAS is the study of the properties of the heaviest of all known quarks, the top quark, where the Manchester Particle Physics Group has many years of experience. The LHCb experiment is designed to study the properties of particles that are built from the heavy bottom and charm quarks. Detailed studies of their production and decays provide a window to new physics and allow us to study fundamental questions such as the origin of the matter-antimatter asymmetry. We are also active on preparing future upgrades to both the ATLAS and LHCb experiments, which will allow their discovery reach to be significantly extended.The Muon g-2 experiment at will examine the precession of muons that are subjected to a magnetic field. The main goal is to test the Standard Model's predictions of this value by measuring the precession rate to a precision of 0.14 parts per million. If there is an inconsistency, it could indicate the Standard Model is incomplete. The goal of the Mu2e experiment is to find conversions of muons into electrons without the emission of neutrinos. Understanding the properties of the elusive neutrino is another priority of our research programme. With the SuperNEMO detector, located in the Modane Underground Laboratory, we search for neutrinoless double beta decay, a process that has never been observed before. Its observation would indicate that neutrinos are their own antiparticles and it will provide a measurement of the neutrino mass. A different kind of experiment, DUNE, will use a novel technology based on liquid argon to detect neutrinos that have been sent through the Earth, in a beam pointing from Fermilab in Chicago to a mine in South Dakota. The goal of this experiment is to learn whether neutrinos violate the fundamental symmetry between matter and antimatter. The experiment could also detect large numbers of neutrinos from a supernova explosion. A similar kind of experiment (SBND/MicroBooNE) uses neutrinos close to the source at Fermilab to search for 'sterile' neutrinos that do not interact via any of the fundamental interactions of the Standard Model except gravity.Modern Particle Physics experiments contain sophisticated technology to detect particles. The Manchester Group leads an extensive reasearch programme on developing novel detection devices, such as 3-dimensional silicon detectors and diamond detectors. These novel technologies have many potential applications beyond Particle Physics research, in areas such as medical physics and security applications. Particle Physics experimentation requires the reconstruction and analysis of large, complex data sets. We operate a large computing facility which supports data analysis for several of these large projects. We develop and apply sophisticated analysis techniques to large data sets.Finally, through our outreach programme, we communicate the results of our research to the public through the media, public lectures and masterclasses.