LHC的ATLAS探测器的最新重离子结果
Recent Heavy Ion Results with the ATLAS Detector at the LHC
摘要：
结果来自2010年LHC重离子运行的ATLAS合作，在此期间提供了近10个逆微仓的光度。软物理结果包括带电粒子多重性和集体流。带电粒子的多重性，跟踪初始状态的熵产生，增加了两个相对于顶部RHIC能量的因素，与中心依赖性非常相似，已经在RHIC测量。大横动量椭圆流的测量也显示出与RHIC测量结果相似的结果，但没有明显的赝快度依赖性。这些测量也被扩展到更高的谐波，并可以用来解释长期以来归因于射流介质相互作用的两粒子关联函数的结构。新的硬探针测量包括单μ子，喷流和高$p_T$强子。在高动量的单μ子被用来提取产量的$W^{\pm}$玻色子，并发现是一致的统计不确定性与二进制碰撞标度。相反，射流被发现被抑制在中心事件的两个相对于周边事件的一个因素，没有显着的依赖于射流能量。碎片化功能也被发现是相同的，在中央和周边的事件。最后，带电强子已被测量到30 GeV，其相对于外围事件的中心依赖性类似于喷气式飞机。
英文摘要：
Results are presented from the ATLAS collaboration from the 2010 LHC heavy ion run, during which nearly 10 inverse microbarns of luminosity were delivered. Soft physics results include charged particle multiplicities and collective flow. The charged particle multiplicity, which tracks initial state entropy production, increases by a factor of two relative to the top RHIC energy, with a centrality dependence very similar to that already measured at RHIC. Measurements of elliptic flow out to large transverse momentum also show similar results to what was measured at RHIC, but no significant pseudorapidity dependence. Extensions of these measurements to higher harmonics have also been made, and can be used to explain structures in the two-particle correlation functions that had long been attributed to jet-medium interactions. New hard probe measurements include single muons, jets and high $p_T$ hadrons. Single muons at high momentum are used to extract the yield of $W^{\pm}$ bosons and are found to be consistent within statistical uncertainties with binary collision scaling. Conversely, jets are found to be suppressed in central events by a factor of two relative to peripheral events, with no significant dependence on the jet energy. Fragmentation functions are also found to be the same in central and peripheral events. Finally, charged hadrons have been measured out to 30 GeV, and their centrality dependence relative to peripheral events is similar to that found for jets.
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