Studying Electroweak Gauge-Boson Self-Interactions in Final States including a Z and a Photon

这个学生项目研究用ATLAS探测器收集的质子-质子碰撞数据中的双重和三重电弱规范玻色子（W，Z，光子）的产生。这项工作建立在之前使用ATLAS在2015-2018年收集的数据对Z+光子产生的测量的基础上，并将研究Z+光子是由入射质子的成分发出的电弱玻色子碰撞产生的过程（“矢量玻色子散射”）以及三个矢量玻色子的产生，包括Z，光子和另一个电弱规范玻色子。这些测量应该提供ATLAS对其中一些过程的初步观察，并将在任何情况下探测可能高于标准模型的生产率，限制超出标准模型的影响。此外，更详细的研究Z+光子的最终状态，相比以前所做的。此外，正在研究第二轮选举的表现，（“第二阶段”）触发ATLAS升级，特别是在第一级触发电子和光子（“0级”）-必须在今后几年内详细实施这些触发因素的改进算法，该项目将实现这一点。进一步预计，该项目将包括触发系统的一些操作责任，当LHC数据-该项目分析了欧洲核子研究中心大型强子对撞机（LHC）2015-2018年数据采集运行的实验数据，还将包括对下一个数据的首次观察，预计将从2021年开始，特别是如果LHC的碰撞能量增加的话。所描述的大部分工作将由学生完成，并有适当的监督，并与伯明翰的同事以及ATLAS合作组织的其他成员机构密切合作。

This student project studies double and triple electroweak gauge boson (W,Z,photon) production in proton-proton collision data collected with the ATLAS detector. The work builds on previous measurements of Z+photon production using ATLAS data collected in 2015-2018, and will look both at processes where the Z+photon is produced by collision of electroweak bosons emitted off the constituents of the incoming protons ("vector-boson scattering") as well as production of three vector bosons including Z, photon and another electroweak gauge boson. These measurements should provide first observations of some of these processes with ATLAS, and will in any case probe for possible higher-than-Standard Model production rates, constraining beyond-the-Standard Model effects. Furthermore more detailed studies of the Z+photon final-state will be made, compared to those done previously. In addition, studies are being made of the performance of the second round ("Phase-II") trigger upgrade of ATLAS, specifically with regard to electron and photon triggering at the very first level ("Level-0") - detailed implementation of improved algorithms for these triggers must be established in the coming years, and the project will deliver this.It is further anticipated that the project will include some operational responsibility for the trigger system when LHC data-taking restarts in 2021.The project analyses experimental data from the 2015-2018 data-taking run of the CERN Large Hadron Collider (LHC), and will also include a first look at the next data, which is expected to arrive from 2021 - especially if the LHC collision energy is increased then.The bulk of all the work described will be done by the student, with appropriate supervision, and in close collaboration with colleagues in Birmingham, and from other institutes which are members of the ATLAS Collaboration.