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arXiv 1002.0534nucl-ex
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sqrt(s_NN)= 200 GeV时金-金碰撞中的非流关联和椭圆流涨落

Non-flow correlations and elliptic flow fluctuations in gold-gold collisions at sqrt(s_NN)= 200 GeV

B. Alver

摘要:

本文给出了在sqrt(sNN)= 200 Gev的Au+Au碰撞中的逐事件椭圆流涨落的结果,其中扣除了非流关联的贡献。引入了一种分析方法来测量非流动相关性,该方法依赖于非流动相关性在短范围内(Δ eta < 2)最突出的假设。假设非流动相关性是在p+p碰撞中观察到的长程相关性(Δ eta > 2)的量级,则观察到约30-40%的相对椭圆流动波动。这些结果与基于初始核重叠区参与核子空间涨落的预测是一致的。据发现,在Au+Au碰撞中的长程非流动相关性将不得不比p+p数据强一个数量级以上,以导致观察到的方位角各向异性波动,没有内在的椭圆流波动。

英文摘要:

This paper presents results on event-by-event elliptic flow fluctuations in Au+Au collisions at sqrt(s_NN)=200Gev, where the contribution from non-flow correlations has been subtracted. An analysis method is introduced to measure non-flow correlations, relying on the assumption that non-flow correlations are most prominent at short ranges (Delta eta < 2). Assuming that non-flow correlations are of the order that is observed in p+p collisions for long range correlations (Delta eta > 2), relative elliptic flow fluctuations of approximately 30-40% are observed. These results are consistent with predictions based on spatial fluctuations of the participating nucleons in the initial nuclear overlap region. It is found that the long range non-flow correlations in Au+Au collisions would have to be more than an order of magnitude stronger compared to the p+p data to lead to the observed azimuthal anisotropy fluctuations with no intrinsic elliptic flow fluctuations.

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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