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arXiv 0907.4796nucl-ex
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PHENIX中d+Au碰撞的单粒子探测

Single Particle Probes of d+Au Collisions in PHENIX

Zvi Citron

摘要:

氘-金碰撞提供了对原子核结构功能的深入了解,并为Au+Au碰撞提供了有价值的基线。测量强子和光子的PHENIX中心臂中d+Au中的核修改因子R_{dAu},使我们能够将冷核物质效应从Au+Au碰撞中重要的热介质效应中分离出来。此外,d+Au系统可以对Au核的胶子结构产生重要的见解。RHIC实验先前测量了相对于由二元N-N碰撞数量标度的p+p的前向快度粒子产生的抑制,但这些数据的明确解释迄今为止还很难找到。具有大快度间隙的强子之间的相关性是胶子饱和度的一个特别敏感的探针。我们将讨论通过在不同快度的高动量粒子标记的事件中的粒子产生来探测这种物理,以及在新的向前快度区域中的R_{dAu}。

英文摘要:

Deuteron-gold collisions provide insights into the nuclear structure function and a valuable baseline for Au+Au collisions. Measurement of the nuclear modification factor, R_{dAu}, in d+Au in the PHENIX central arms for hadrons and photons allows us to disentangle cold nuclear matter effects from the hot medium effects that are important in Au+Au collisions. In addition, the d+Au system can yield important insights into the gluonic structure of the Au nucleus. RHIC experiments have previously measured suppression of forward rapidity particle production relative to p+p scaled by the number of binary N-N collisions, but a definitive explanation of these data is thus far elusive. Correlations between hadrons with a large rapidity gap are a particularly sensitive probe of gluon saturation. We will discuss probing this physics via particle production in events tagged with high momentum particles at different rapidities, along with R_{dAu} in new forward rapidity regions.

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