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Parallelising the ATLAS Trigger and Analysis on the Higgs Boson

并行 ATLAS 触发器和希格斯玻色子分析

基本信息

批准号：
2438582
负责人：
金额：
--
依托单位：
University of Warwick
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2020
资助国家：
英国
起止时间：
2020 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2438582
关键词：
Parallelising ATLAS Trigger Analysis Higgs

项目摘要

The first part of the project is to optimise, validate and commission the new ATLAS High Level Trigger software that is being re-written utilizing modern software techniques to fully exploit new computing architectures. The ATLAS High Level Trigger decides which collision events are to be recorded for analysis offline and which are to be discarded. Only 1 in a 100 events can be kept. The High Level Trigger does this by reconstructing features characteristic of, for example, electrons, muons, tau-leptons or groups of nearby particle (jets) using software algorithms that run on a farm of computers. The software has to be fast so that the farm can process 100,000 events per second, so each event must take less than one fifth of a second. At the moment, each computer processor core works on its own set of events running algorithms sequentially. The software is being upgraded to be fully multi-threaded so that algorithms can run in parallel. You will optimise and validate the software and help to commission the trigger to ensure it is ready for use online in 2021 when the LHC restarts after the current shutdown.The other part of the project is a physics analysis of ATLAS data where the student will investigate properties of the Higgs boson in the ditau final state. The analysis focuses on boosted Higgs boson decays to search for deviations arising from additional couplings of the Higgs boson to unknown particles.

该项目的第一部分是优化、验证和调试新的ATLAS高级触发软件，该软件正在利用现代软件技术进行重写，以充分利用新的计算架构。ATLAS高级触发器决定记录哪些碰撞事件用于离线分析，以及哪些要丢弃。100个项目中只有1个可以保留。高级触发器通过使用在计算机群上运行的软件算法重建例如电子、介子、超轻子或附近粒子(喷流)组的特征来实现这一点。软件必须很快，这样场才能每秒处理100,000个事件，所以每个事件所需的时间必须不到五分之一秒。目前，每个计算机处理器核心都按顺序处理自己的一组运行算法的事件。该软件正在升级为完全多线程的，以便算法可以并行运行。你将优化和验证软件，并帮助调试触发器，以确保在2021年大型强子对撞机在当前关闭后重新启动时，它可以在线使用。项目的另一部分是对ATLAS数据的物理分析，学生将研究希格斯玻色子在ditau最终状态下的性质。分析的重点是增强的希格斯玻色子衰变，以寻找由于希格斯玻色子与未知粒子的额外耦合而产生的偏差。