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arXiv 1106.5902nucl-exhep-exhep-phnucl-th
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来自RHIC射束能量扫描程序的STAR实验结果

STAR experiment results from the beam energy scan program at RHIC

Bedangadas Mohanty

摘要:

我们提出的第一个结果,使用星探测器从束能量扫描(BES)计划在相对论重离子对撞机(RHIC)。在这个计划中,金离子碰撞中心质心能量(\sqrt{s_{NN}})为7.7,11.5和39 GeV允许RHIC扩展的QCD相图的研究重子化学势值为20 MeV到约400 MeV。对于在这些碰撞中形成的高净重子密度物质,我们报告了几个有趣的测量结果。其中包括观测到反粒子和粒子椭圆流之间的差异、同号和反号带电粒子之间相对于事件平面的动力学方位角相关的差异消失、质子冻结和定向流时偏心率斜率的变化作为\sqrt{s_{NN}}的函数以及高阶涨落偏离强子共振气体和泊松期望。这些意见的可能解释进行了讨论。

英文摘要:

We present the first results using the STAR detector from the Beam Energy Scan (BES) program at the Relativistic Heavy-Ion Collider (RHIC). In this program, Au ion collisions at center of mass energies (\sqrt{s_{NN}}) of 7.7, 11.5 and 39 GeV allowed RHIC to extend the study of the QCD phase diagram from baryonic chemical potential values of 20 MeV to about 400 MeV. For the high net-baryon density matter at midrapidity, formed in these collisions, we report several interesting measurements. These include the observation of difference between anti-particle and particle elliptic flow, disappearance of the difference in dynamical azimuthal correlations with respect to event plane between same and opposite signed charged particles, change in slope of eccentricity at freeze-out and directed flow of protons as a function of \sqrt{s_{NN}} and the deviation of higher order fluctuations from hadron resonance gas and Poissonian expectations. Possible interpretations of these observations are also discussed.

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