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首页> 外文期刊>Physical review letters >Directed Flow of Charged Particles at Midrapidity Relative to the Spectator Plane in Pb-Pb Collisions at (√S_NN) = 2.76 Te V
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Directed Flow of Charged Particles at Midrapidity Relative to the Spectator Plane in Pb-Pb Collisions at (√S_NN) = 2.76 Te V

机译：在（√S_NN）= 2.76 Te V的Pb-Pb碰撞中，相对于旁观者平面而言，中速带电粒子的定向流

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摘要

The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at (√S_NN) = 2.76 TeV relative to the collision symmetry plane defined by the spectator nucleons. A negative slope of the rapidity-odd directed flow component with approximately 3 times smaller magnitude than found at the highest RHIC energy is observed. This suggests a smaller longitudinal tilt of the initial system and disfavors the strong fireball rotation predicted for the LHC energies. The rapidity-even directed flow component is measured for the first time with spectators and found to be independent of pseudorapidity with a sign change at transverse momenta p_T between 1.2 and 1.7 GeV/c. Combined with the observation of a vanishing rapidity-even p_T shift along the spectator deflection this is strong evidence for dipolelike initial density fluctuations in the overlap zone of the nuclei. Similar trends in the rapidity-even directed flow and the estimate from two-particle correlations at midrapidity, which is larger by about a factor of 40, indicate a weak correlation between fluctuating participant and spectator symmetry planes. These observations open new possibilities for investigation of the initial conditions in heavy-ion collisions with spectator nucleons.
机译：相对于旁观者核子定义的碰撞对称平面，在（√S_NN）= 2.76 TeV的Pb-Pb碰撞中测量带电粒子在中间快时的定向流动。观察到速度奇异的导流分量的负斜率，其幅度比在最高RHIC能量处的负斜率小约3倍。这表明初始系统的纵向倾斜较小，不利于LHC能量预测的强劲火球旋转。观众首次测量了速度均匀的定向流动分量，并发现其与伪快速度无关，其横向矩p_T在1.2和1.7 GeV / c之间发生符号变化。结合观察到的迅速消失-沿旁观者偏转的p_T位移消失，这有力地证明了核重叠区域中偶极子状的初始密度起伏。速度甚至均匀流的相似趋势以及中速时两粒子相关性的估计值（大约大40倍）表明波动的参与者和观众对称平面之间的相关性较弱。这些观察为研究重离子与旁观者核子碰撞的初始条件提供了新的可能性。

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  • 来源
    《Physical review letters》 |2013年第23期|232302.1-232302.11|共11页
  • 作者

    B. Abelev; J. Adam; D. Adamova; A.M. Adare; M.M. Aggarwal; et al;

  • 作者单位

    Lawrence Livermore National Laboratory, Livermore, California, USA;

    Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic;

    Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Rez u Prahy, Czech Republic;

    Yale University, New Haven, Connecticut, USA;

    Physics Department, Panjab University, Chandigarh, India;

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  • 正文语种 eng
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  • 关键词

    relativistic heavy-ion collisions; collective flow;

    机译：相对论重离子碰撞;集体流动;

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