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首页> 外文学位 >Measurement of Dielectron Invariant Mass Spectra in Au + Au Collisions at p sNN = 200GeV with HBD in PHENIX.
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Measurement of Dielectron Invariant Mass Spectra in Au + Au Collisions at p sNN = 200GeV with HBD in PHENIX.

机译：用PHENIX中的HBD在p sNN = 200GeV下测量Au + Au碰撞中的双电子不变质谱。

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摘要

Dileptons are emitted throughout the entire space-time evolution of heavy ion collisions. Being colorless, these electromagnetic probes do not participate in the final-state strong interactions during the passage through the hot medium, and retain the information on the conditions of their creation. This characteristic renders them valuable tools for studying the properties of the Quark Gluon Plasma created during ultra-relativistic heavy ion collisions. The invariant mass spectra of dileptons contain a wealth of information on every stage of the evolution of heavy ion collisions. At low mass, dilepton spectra consist mainly of light meson decays. The medium modification of the light vector mesons gives insight on the chiral symmetry restoration in heavy ion collisions. At intermediate and high mass, there are significant contributions from charm and bottom, with a minor contribution from QGP thermal radiation. The region was utilized to measure cross sections of open charm and open bottom, as well as quarkonium suppression as demonstrated by PHENIX.;An earlier PHENIX measurement of dielectron spectra in heavy ion collisions, using data taken in 2004, shows significant deviations from the hadronic decay expectations. The measurement, however, suffered from an unfavorable signal to background ratio. Random combination of electron-positron pairs from unrelated sources, mostly Dalitz decay of pi0 and external conversion of decay photon to electrons, is the main contributor to the background. Mis-identified hadrons are another major background source.;To improve the situation, the Hadron Blind Detector (HBD), a windowless proximity focusing Cerenkov detector, is designed to reduce this background by identifying electron tracks from photon conversions and ;0
机译：在重离子碰撞的整个时空演化过程中，会释放出二轻子。由于是无色的，这些电磁探针在通过热介质的过程中不会参与最终状态的强相互作用，并保留有关其创建条件的信息。这一特性使它们成为研究超相对论重离子碰撞过程中产生的夸克胶子等离子体性质的有价值的工具。在重离子碰撞演化的每个阶段，二酮的不变质谱都包含大量信息。在低质量下，双峰谱主要由轻介子衰变组成。轻质矢量介子的中等修饰可以深入了解重离子碰撞中的手性对称性。在中等质量和高质量下，魅力和底部的贡献很大，而QGP热辐射的贡献很小。如PHENIX所展示的那样，该区域被用于测量开放魅力和开放底部的横截面以及石英的抑制作用；较早的PHENIX利用2004年获得的数据对重离子碰撞中的双电子光谱​​进行了测量，结果表明其与强子酸有显着偏差衰减期望。然而，该测量遭受不利的信噪比。来自无关来源的电子-正电子对的随机组合（主要是pi0的Dalitz衰变和光子向电子的外部转化）是背景的主要贡献者。识别错误的强子是另一个主要的背景源。为了改善这种情况，Hadron盲检测器（HBD）是一种无窗近距聚焦切伦科夫检测器，旨在通过识别来自光子转换和0的电子轨迹来减少该背景。

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  • 作者

    Sun, Jiayin.;

  • 作者单位

    State University of New York at Stony Brook.;

  • 授予单位 State University of New York at Stony Brook.;
  • 学科 Nuclear physics and radiation.
  • 学位 Ph.D.
  • 年度 2016
  • 页码 221 p.
  • 总页数 221
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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