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arXiv 0708.3015nucl-th
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在LHC的递减椭圆流:用部分子复合方法的计算

Decreasing elliptic flow at the LHC: Calculations in a parton recombination approach

Daniel Krieg, Marcus Bleicher

摘要:

本文应用部分子复合方法研究了从AGS到LHC能量范围内重离子碰撞中椭圆流v_2的能量依赖性。通过对可用数据的拟合获得各种质心能量下的相关输入量($T, μ_B, η_T$)。该模型能很好地描述从AGS到RHIC能区中快度带电粒子的v_2积分数据。与目前的预期形成鲜明对比的是,我们观察到在最高RHIC能量以上的积分v_2值的减小。因此,我们预测在LHC能量v_2的减少相比,RHIC的结果。这种下降是由于负的v_2值的基础部分子分布在低到中等的横向动量,发展,如果横向流动速度是足够高的。在LHC以上的能量范围内,本方法甚至预测积分v_2为负值。

英文摘要:

We apply the parton recombination approach to study the energy dependence of the elliptic flow, v_2 in heavy ion collisions from AGS to LHC energies. The relevant input quantities ($T, μ_B, η_T$) at the various center of mass energies are obtained from fits to the available data. The model yields a good description of the integrated v_2 data for charged particles at midrapidity from AGS to RHIC energies. In stark contrast to the current expectations, we observe a decrease of the integrated v_2 values above the highest RHIC energy. Thus, we predict a decrease of v_2 at LHC energies compared to the RHIC results. This drop is attributed to negative v_2 values for the underlying parton distributions at low to moderate transverse momenta that develops if the transverse flow velocity is high enough. At energies above the LHC regime, the present approach predicts even negative values for the integrated v_2.

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