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首页> 外文学位 >A study of observability of Higgs boson decay in Higgs boson decays to two Z mesons decays to four leptons at CMS.
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A study of observability of Higgs boson decay in Higgs boson decays to two Z mesons decays to four leptons at CMS.

机译：希格斯玻色子衰变至两个Z介子衰变至四个轻子的希格斯玻色子衰变的可观测性研究。

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摘要

The Standard Model (SM) of particle physics has been the most successful theory about fundamental particles and how they interact. In SM, the originally massless fundamental particles acquire masses in a process called the Higgs mechanism. This mechanism involves an additional particle, called the Higgs boson, whose responsibility is to break the electroweak symmetry and help those massless particles acquire masses. With the discovery of the top quark at Tevatron in 1995, the Higgs boson remains to be the only unfound fundamental particle in the Standard Model. The discovery of the Higgs boson would greatly increase our understanding of the origin of the mass.; One of the most important objectives of the LHC experiment is to discover the Higgs boson. At LHC, the CMS experiment is optimized for the search of the Higgs boson over a mass range up to 1 TeV. Among all Higgs decay channels, H → ZZ → 4l is one of the most promising channels to search the SM Higgs boson at CMS.; This study concentrates on the observability of the SM Higgs boson in H → ZZ → 4l channel at CMS. The H → ZZ → 4l signal has been investigated against its main background processes ZZ(*) → 4l, Zbb¯ → 4l + X and tt¯ → 4l + X by applying various selections and cuts. The event generation and preselection have been done with CMKIN interfaced with PYTHIA and COMPHEP, the simulation of the preselection and reconstruction has been done with the fast simulation software CMSJET. The result presented in this work shows that after 1-year of LHC running at it design luminosity phase, it is inevitable to claim the discovery of the SM Higgs boson in this H → ZZ → 4 l channel, if the Higgs boson has a mass of 200--600 GeV. For very heavy Higgs boson (mH ∼ 700 GeV or above), the Higgs boson signal may be observed, but the statistics is too low. The observability for low luminosity phase is also studied.
机译：粒子物理学的标准模型（SM）是有关基本粒子及其相互作用方式的最成功理论。在SM中，最初无质量的基本粒子通过称为希格斯机制的过程获得质量。该机制涉及一个称为希格斯玻色子的附加粒子，它的职责是打破电弱对称性并帮助那些无质量的粒子获取质量。随着1995年Tevatron的顶级夸克的发现，希格斯玻色子仍然是标准模型中唯一未发现的基本粒子。希格斯玻色子的发现将大大增加我们对物质起源的认识。 LHC实验的最重要目标之一是发现希格斯玻色子。在大型强子对撞机中，CMS实验经过了优化，可在高达1 TeV的质量范围内搜索希格斯玻色子。在所有希格斯衰变通道中，H→ZZ→4l是在CMS上搜索SM希格斯玻色子的最有希望的通道之一。这项研究集中于在CMS的H→ZZ→4l通道中SM希格斯玻色子的可观察性。针对H→ZZ→4l信号，通过应用各种选择和削减，针对其主要背景处理ZZ（*）→4l，Zbb¯→4l + X和tt→4l + X进行了研究。事件生成和预选已通过将CMKIN与PYTHIA和COMPHEP进行接口来完成，预选和重构的仿真已通过快速仿真软件CMSJET进行了。这项工作给出的结果表明，在LHC在其设计光度阶段运行了1年后，如果希格斯玻色子具有质量，就不可避免地要求在H→ZZ→4 l通道中发现SM希格斯玻色子。 200--600 GeV的对于非常重的希格斯玻色子（mH〜700 GeV或更高），可以观察到希格斯玻色子信号，但统计数据太低。还研究了低发光相的可观察性。

著录项

  • 作者

    Liang, Guiwen.;

  • 作者单位

    The Johns Hopkins University.;

  • 授予单位 The Johns Hopkins University.;
  • 学科 Physics Elementary Particles and High Energy.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 138 p.
  • 总页数 138
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 高能物理学;
  • 关键词

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