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arXiv 1012.2590nucl-ex
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STAR中高$p_T$触发的双强子关联的近侧系统尺寸和能量依赖性

System size and energy dependence of the near-side of high-$p_T$ triggered di-hadron correlations in STAR

Christine Nattrass

摘要:

以往的研究表明,高pT触发的双强子关联的近侧峰可以分解为两部分:喷流关联和脊。我们目前的数据从铜+铜和金+金碰撞sqrt(sNN)=62和200 GeV,这应该允许更强大的模型测试。喷流的相关性是狭窄的方位角和赝快度,并具有类似的预期从真空碎裂的属性。在喷流相关粒子的产量为两个系统,并在两种能量和相比,预计从双强子相关PYTHIA 8.1的产量。该脊的方位角较窄,但赝快度较宽,在STAR的接受范围内与赝快度大致无关。人们曾试图解释脊分量的产生来自复合、动量反冲、等离子体通量管和等离子体不稳定性。然而,很少有模型试图定量计算的特点的山脊。比较了所有系统和能量的脊中的产率。在LHC的测量的影响进行了讨论的数据和模型的背景下。

英文摘要:

Previous studies have indicated that the near-side peak of high-pT triggered di-hadron correlations can be decomposed into two parts, a jet-like correlation and the ridge. We present data from Cu+Cu and Au+Au collisions at sqrt(sNN)=62 and 200 GeV, which should allow more robust tests of models. The jet-like correlation is narrow in both azimuth and pseudorapidity and has properties similar to those expected from vacuum fragmentation. The yield of particles in the jet-like correlation are presented for both systems and at both energies and compared to the yields expected from di-hadron correlations in PYTHIA 8.1. The ridge is narrow in azimuth but broad in pseudorapidity and roughly independent of pseudorapidity within STAR's acceptance. Attempts have been made to explain the production of the ridge component as coming from recombination, momentum kicks, Glasma flux tubes, and a plasma instability. However, few models have attempted to quantitatively calculate the characteristics of the ridge. The yield in the ridge is compared for all systems and energies. The implications for measurements at the LHC are discussed in context of the data and models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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