arXiv 0810.41162008-10nucl-thhep-phnucl-ex

喷流猝灭的角度依赖性表明其在QCD相变附近的强烈增强

Angular Dependence of Jet Quenching Indicates Its Strong Enhancement Near the QCD Phase Transition

Jinfeng Liao, Edward Shuryak

备注：: 4 pages, 4 figures. Final version published as PRL102,202302(2009)
发表信息：: Phys.Rev.Lett.102:202302,2009
DOI：: 10.1103/PhysRevLett.102.202302

摘要：

利用RHIC数据提供的火球“层析成像”技术，研究了不同中心度下高产额$p_t$强子方位各向异性$v_2$的喷流淬灭对物质密度的依赖性。将火球切成具有恒定（熵）密度的壳层，我们得到了一个“逐层几何极限”$v_2^{max}$，它确实高于数据$v_2<v_2^{max}$。有趣的是，只有当猝灭由熵密度正好在近$T_c$区域的壳层主导时，才能达到极限。我们展示了两个模型，同时描述了高$p_t$ $v_2$和$R_{AA}$数据，并得出结论，只有当喷流淬灭是几倍强于QGP在$T>T_c$的近$T_c$区域，可以实现这样的描述。一个可能的原因可能是最近的迹象表明，近$T_c$区域是一个相对浅色磁单极的磁性等离子体。

英文摘要：

We study dependence of jet quenching on matter density, using "tomography" of the fireball provided by RHIC data on azimuthal anisotropy $v_2$ of high $p_t$ hadron yield at different centralities. Slicing the fireball into shells with constant (entropy) density, we derive a "layer-wise geometrical limit" $v_2^{max}$ which is indeed above the data $v_2<v_2^{max}$. Interestingly, the limit is reached only if quenching is dominated by shells with the entropy density exactly in the near-$T_c$ region. We show two models that simultaneously describe the high $p_t$ $v_2$ and $R_{AA}$ data and conclude that such a description can be achieved only if the jet quenching is few times stronger in the near-$T_c$ region relative to QGP at $T>T_c$. One possible reason for that may be recent indications that the near-$T_c$ region is a magnetic plasma of relatively light color-magnetic monopoles.

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英文摘要：

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