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首页> 外文学位 >Estimation of the Invisible Z Background to Hadronic Supersymmetry Searches Performed With Proton-Proton Collision Data at 7 and 8 TeV Observed With the CMS Detector During the First Run of the CERN Large Hadron Collider.
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Estimation of the Invisible Z Background to Hadronic Supersymmetry Searches Performed With Proton-Proton Collision Data at 7 and 8 TeV Observed With the CMS Detector During the First Run of the CERN Large Hadron Collider.

机译：在CERN大型强子对撞机首次运行时，用CMS检测器观测到的质子-质子碰撞数据在7和8 TeV处进行的强子超对称搜索的不可见Z背景的估计。

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摘要

In searches for SUSY in all-hadronic channels, events with jets and a Z boson form an irreducible background when the PZ boson decays to a pair of neutrinos. For R-parity conserving susy models, every decay chain involving a superparticle must result in at least one gls{lsp}, which can be neutral and noninteracting. The detector signature for the gls{lsp} is identical to that of the two neutrinos from the PZ, which appear as an imbalance in the transverse momentum of the event. The characterization of these types of events is crucially important in any search for new physics performed in a multi-jets+missing transverse momentum channel. A method for estimating this irreducible background using events with a measured photon is presented, and the results for a search performed in the all-hadronic multi-jet channel are shown to be consistent with standard model expectations. Limits are set on the mass of expected new particles in various models.
机译：在全强子气通道中搜索SUSY时，当PZ玻色子衰变成一对中微子时，射流和Z玻色子的事件形成了不可还原的背景。对于R奇偶性守恒模型，每个涉及超粒子的衰变链都必须产生至少一个gls {lsp}，该信号可能是中性的且不相互作用。 gls {lsp}的探测器特征与来自PZ的两个中微子的特征相同，它们表现为事件的横向动量不平衡。这些类型的事件的表征对于在多喷流+缺失横向动量通道中进行的新物理研究中至关重要。提出了一种使用带有测得的光子的事件来估计这种不可还原的背景的方法，并且显示了在全强旋流多喷流通道中执行的搜索结果与标准模型期望值一致。对各种模型中预期的新粒子的质量设置了限制。

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  • 作者

    Sturdy, Jared Todd.;

  • 作者单位

    University of California, Riverside.;

  • 授予单位 University of California, Riverside.;
  • 学科 Physics Elementary Particles and High Energy.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 184 p.
  • 总页数 184
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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