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首页> 外文学位 >Measurement of the azimuthal anisotropy for charged particle production in Pb+Pb collisions at sNN =2.76 TeV and in p+Pb collisions at sNN =5.02 TeV with the ATLAS detector at the LHC.
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Measurement of the azimuthal anisotropy for charged particle production in Pb+Pb collisions at sNN =2.76 TeV and in p+Pb collisions at sNN =5.02 TeV with the ATLAS detector at the LHC.

机译：用LHC处的ATLAS探测器测量在sNN = 2.76 TeV时Pb + Pb碰撞中和在sNN = 5.02 TeV时p + Pb碰撞中带电粒子产生的方位各向异性。

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摘要

In this work, detailed measurements of the pT, eta and centrality dependence of the flow harmonics vn in Pb+Pb collisions at sNN = 2.76 TeV with the ATLAS detector at the LHC are presented. Consistent values of harmonics v2-v 6 are measured the via event-plane and two-particle correlation methods. Dipolar flow v1 associated with initial dipole asymmetry is measured via two-particle correlations. The long-range correlations in the two-particle correlations such as ridge and the cone are shown to be accounted for by collective flow. Sizable values of the odd harmonics especially v3 are measured that indicate significant event-by-event (EbyE) fluctuations in the initial geometry.;The nature of the initial collision geometry and the hydrodynamic response to it are investigated by measuring the EbyE distributions for harmonics v2-v4, as well as correlations between two and three event-planes phin of different orders. These measurements show the presense of considerable EbyE fluctuations in the initial geometry as well as the importance of non-linear hydrodynamic response of the medium to these fluctuations. By measuring the EbyE vn distributions separately for particles with pT > 1 GeV and with pT ∈ (0.5, 1.0) GeV, the hydrodynamic response is shown to factorize into a function of pT and a function of the initial geometry. The EbyE vn distributions are shown to contain additional information than the multi-particle cumulants.;Two-particle correlations in p+Pb collisions at sNN = 5.02 TeV are measured. Long range correlations are observed along Deltaeta at Delta&phis; ∼ 0 that increase with increasing event-activity. A symmetric long range correlation is also shown to exist at Delta&phis; ∼ pi which is obtained by subtracting out the expected contribution from recoiling dijets. These correlations are shown to be similar to those seen in Pb+Pb collisions suggesting similar physics in both systems.
机译：在这项工作中，在LHC上使用ATLAS探测器对sNN = 2.76 TeV的Pb + Pb碰撞中的流动谐波vn的pT，η和中心性依赖性进行了详细测量。谐波v2-v 6的一致值是通过事件平面和两粒子相关方法测量的。与初始偶极子不对称相关的偶极子流v1通过两粒子相关性进行测量。两个粒子相关性（例如山脊和圆锥形）中的远距离相关性显示为集体流动引起的。测量了奇数谐波的相当大的值，尤其是v3，这表明初始几何中的逐个事件（EbyE）有明显的波动;通过测量谐波的EbyE分布来研究初始碰撞几何的性质和对其的流体动力响应v2-v4，以及两个和三个不同阶的事件平面之间的关联。这些测量结果表明，初始几何形状中存在明显的EbyE波动，以及介质对这些波动的非线性流体动力响应的重要性。通过分别测量pT> 1 GeV和pT∈（0.5，1.0）GeV的粒子的EbyE vn分布，流体动力响应可以分解为pT的函数和初始几何形状的函数。 EbyE vn分布显示为包含多粒子累积量以外的其他信息。;测量了sNN = 5.02 TeV时p + Pb碰撞中的两粒子相关性。在Delta＆phis沿Deltaeta观察到远距离相关性； 〜0随着事件活动性的增加而增加。还显示了在Delta＆phis处存在对称的远程相关性。 pi是通过从反冲双喷中减去预期贡献而获得的。这些相关性显示与在Pb + Pb碰撞中看到的相似，表明两个系统的物理性质相似。

著录项

  • 作者

    Mohapatra, Soumya.;

  • 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 Physics Radiation.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 279 p.
  • 总页数 279
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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