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arXiv 1509.08833nucl-ex
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STAR对$\sqrt{s_{NN}}=200$ GeV中心Au+Au碰撞双喷注不平衡的测量

Di-Jet Imbalance Measurements in Central Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV from STAR

Kolja Kauder

备注：
To appear in Proceedings of Hard Probes 2015
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摘要：

STAR合作报告了RHIC中心金-金碰撞和最小偏置质子-质子碰撞中双喷流对的横向动量不对称性$A_J$的首次测量结果，测量值为$\sqrt{s_{NN}}=200$ GeV。我们专注于反$k_T$双喷流与领先的射流$p_T>20$ GeV/ $c$和副领先的射流$p_T>10$ GeV/ $c$，与2 GeV/ $c$，这减少了底层重离子背景的影响的组成削减。我们研究了$A_J$的演变，同时重新聚类这些相同的双喷气机与较低的成分削减200兆电子伏/ $c$。对于低$p_T$组分切割与$R=0.4$的分辨率参数，双喷流之间的平衡恢复到p+p碰撞的水平，这表明观察到的损失的能量与组分切割的$p_T ^{\text{Cut}}>2$ GeV/ $c$的双喷流恢复。$R$和组分\pT -截止值的进一步变化表明，损失的能量以软颗粒的形式重新分布，伴随着射流结构的加宽。

英文摘要：

The STAR collaboration reports the first measurements of the transverse momentum asymmetry $A_J$ of di-jet pairs in central gold-gold collisions and minimum bias proton-proton collisions at $\sqrt{s_{NN}}=200$ GeV at RHIC. We focus on anti-$k_T$ di-jets with a leading jet $p_T>20$ GeV/$c$ and a subleading jet $p_T>10$ GeV/$c$, with a constituent cut of 2 GeV/$c$, which reduces the effect of the underlying heavy-ion background. We examine the evolution of $A_J$ while reclustering these same di-jets with a lower constituent cut of 200 MeV/$c$. For the low $p_T$ constituent cut with a resolution parameter of $R=0.4$, the balance between the di-jets is restored to the level of p+p collisions which indicates the lost energy observed for di-jets with a constituent cut of $p_T ^{\text{Cut}}>2$ GeV/$c$ is recovered. Further variations of $R$ and the constituent \pT-cutoff indicate that the lost energy is redistributed in the form of soft particles, accompanied by a broadening of the jet structure.

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