用双强子关联测量RHI碰撞中的$\hat{q}$

M. Tannenbaum
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引用次数: 0

摘要

在BDMPSZ模型中,介质中出射部分的能量损失 $-dE/dx$ 是输运系数 $\hat{q}$ 时代 $L$ 行进的长度。这导致喷射淬火,这是公认的。然而,BDMPSZ也预测了双喷流的方位角展宽也与 $\hat{q}L$ 到目前为止还没有观察到。加宽后应产生较大的 $k_T$ 在A$+$A比p$+$P次碰撞。这个演示介绍了观察 $k_T$ 以p计$+$双强子的P碰撞 $p_{Tt}$ 和 $p_{Ta}$ 必须减小以补偿触发子和远离子的能量损失,当与 $k_T$ 用同一双强子测量 $p_{Tt}$ 和 $p_{Ta}$ 在A$+$A碰撞。这个想法被应用到最近对Au的STAR双强子测量中$+$Au: $\sqrt{s_{NN}}$= 200gev,[物理]左。B760(2016) 689],结果 $ =2.1\pm 0.6$ GeV$^2$. 这是更精确的,但与理论计算一致 $ =14^{+42}_{-14}$ GeV$^2$ 使用相同的数据。假设一个长度 $ \approx 7$ 中澳fm$+$现在的结果给出了 $\hat{q}\approx 0.30\pm 0.09$ GeV$^2$/fm,与单强子抑制的结果基本一致 $\hat{q}\approx 1.2\pm 0.3$ GeV$^2$初始时间为/fm $\tau_0=0.6$ Au中的fm/c$+$金碰撞 $\sqrt{s_{NN}}=200$ GeV。有几个有趣的细节要讨论:对于给定的 $p_{Tt}$ the $ $ 似乎会减少,然后随着增加而消失 $p_{Ta}$;喷气式飞机在介质中停留的时间更长。$\approx 7$ Fm /c)然后 $\tau_0=0.6$ Fm /c可能会影响的值 $\hat{q}$ 这将被观察到。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Measurement of $\hat{q}$ in RHI collisions using di-hadron correlations
In the BDMPSZ model, the energy loss of an outgoing parton in a medium $-dE/dx$ is the transport coefficient $\hat{q}$ times $L$ the length traveled. This results in jet quenching, which is well established. However BDMPSZ also predicts an azimuthal broadening of di-jets also proportional to $\hat{q}L$ which has so far not been observed. The broadening should produce a larger $k_T$ in A$+$A than in p$+$p collisions. This presentation introduces the observation that the $k_T$ measured in p$+$p collisions for di-hadrons with $p_{Tt}$ and $p_{Ta}$ must be reduced to compensate for the energy loss of both the trigger and away parent partons when comparing to the $k_T$ measured with the same di-hadron $p_{Tt}$ and $p_{Ta}$ in A$+$A collisions. This idea is applied to a recent STAR di-hadron measurement in Au$+$Au at $\sqrt{s_{NN}}$=200 GeV, [Phys. Lett. B760 (2016) 689], with result $ =2.1\pm 0.6$ GeV$^2$. This is more precise but in agreement with a theoretical calculation of $ =14^{+42}_{-14}$ GeV$^2$ using the same data. Assuming a length $ \approx 7$ fm for central Au$+$Au collisions the present result gives $\hat{q}\approx 0.30\pm 0.09$ GeV$^2$/fm, in fair agreement with the JET collaboration result from single hadron suppression of $\hat{q}\approx 1.2\pm 0.3$ GeV$^2$/fm at an initial time $\tau_0=0.6$ fm/c in Au$+$Au collisions at $\sqrt{s_{NN}}=200$ GeV. There are several interesting details to be discussed: for a given $p_{Tt}$ the $ $ seems to decrease then vanish with increasing $p_{Ta}$; the di-jet spends a much longer time in the medium ($\approx 7$ fm/c) then $\tau_0=0.6$ fm/c which likely affects the value of $\hat{q}$ that would be observed.
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