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arXiv 1601.01644nucl-ex
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金与STAR碰撞中强子抑制的测量及其与低$\sqrt{s_{\mathrm{NN}}}$ $v_{\mathrm{3}}$消失的关系研究

Measurement of hadron suppression and study of its connection with vanishing $v_{\mathrm{3}}$ at low $\sqrt{s_{\mathrm{NN}}}$ in Au+Au collisions with STAR

Stephen Horvat

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摘要：

在RHIC和LHC的最高能量，高横动量（$p_{\mathrm{T}}$）强子的抑制提供了QGP中部分子能量损失的证据。通过研究二体碰撞尺度高$p_{\mathrm{T}}$产额的中心性依赖关系，研究了RHIC束能量扫描（BES）中的部分子能量损失。观察到的缩放产量减少，在更多的中心碰撞提出了作为一个可能的签名射流淬火。即使在能量和中心，这个签名是丢失的QGP仍然可能形成，因为负责增强竞争现象可能会压倒能量损失的抑制。从$\sqrt{s_{_{\mathrm{NN}}}}$ = 7.7、11.5、14.5、19.6、27、39、62.4和200 GeV的几个$p_{\mathrm{T}}$范围的测量数据表明，相对强子抑制至少持续到14.5 GeV。为了进一步研究在这些较低的能量下可能形成的QGP，以及所观察到的强子抑制是否与其他QGP签名的发生相吻合，我们研究了$v_{3}$的能量和中心依赖性。模型表明，$v_{3}$的形成需要在碰撞早期存在低粘度相。我们发现，碰撞与$N_{\mathrm{part}}$ <50，$v_{3}$消失的能量低于14.5 GeV，暗示关闭的QGP。但当$N_{\mathrm{part}}$ >50时，$v_{3}$会持续到最低能量。总之，这些签名提供了在RHIC的最低能量碰撞中形成QGP的可能证据。

英文摘要：

At top RHIC and LHC energies the suppression of high transverse momentum ($p_{\mathrm{T}}$) hadrons provides evidence for partonic energy loss in QGP. We study partonic energy loss in the RHIC Beam Energy Scan (BES) by investigating the centrality dependence of the binary-collision-scaled high-$p_{\mathrm{T}}$ yields. Observing a decrease of the scaled yield in more central collisions is proposed as a possible signature for jet quenching. Even at energies and centralities where this signature is lost a QGP may still be formed since competing phenomena responsible for enhancements may overwhelm the suppression from energy loss. Measurements in several ranges of $p_{\mathrm{T}}$ from $\sqrt{s_{_{\mathrm{NN}}}}$ = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV data show that relative hadron suppression persists at least down to 14.5 GeV. To further investigate both the possible formation of a QGP at these lower energies and whether the observed hadron suppression coincides with the onset of other QGP signatures, we examine the energy and centrality dependence of $v_{3}$. Models have shown that the development of $v_{3}$ requires the presence of a low viscosity phase early in the collision. We find that for collisions with $N_{\mathrm{part}}$<50, $v_{3}$ disappears for energies below 14.5 GeV, suggestive of a turn-off of the QGP. But for $N_{\mathrm{part}}$>50, $v_{3}$ persists down to the lowest energies. Together, these signatures provide possible evidence for the formation of a QGP in the lowest energy collisions at RHIC.

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