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arXiv 1109.2133nucl-ex
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PHENIX中d+Au碰撞前向快度的冷核物质物理

Cold nuclear matter physics at forward rapidities from d+Au collisions in PHENIX

Mickey Chiu

摘要:

我们目前的测量PHENIX实验在RHIC的双强子对生产的\dAu碰撞中的粒子在一个很宽的范围内变化的赝快度,出$η= 3.8$。对于双强子,改变双强子对中粒子的$p_T$和快度可以研究核中部分子$x$的函数效应。这些双强子测量可能会探测到金核中的部分子动量分数x $\sim$ $10^{-3}$,在RHIC中观察胶子饱和效应的可能性最大。我们的测量结果表明,在\dAu碰撞的背靠背对的相关产量被抑制高达一个数量级相对于\pp碰撞,并增加更大的核路径厚度和选择较低的x在金核。

英文摘要:

We present measurements by the PHENIX experiment at RHIC of di-hadron pair production in \dAu collisions where the particles in the pair are varied across a wide range of pseudorapidity, out to $η= 3.8$. With di-hadrons, varying the $p_T$ and rapidity of the particles in the di-hadron pair allows studying any effects as a function of partonic $x$ in the nucleus. These di-hadron measurements might probe down to parton momentum fractions x $\sim$ $10^{-3}$ in the gold nucleus, where the interesting possibility of observing gluon saturation effects at RHIC is the greatest. Our measurements show that the correlated yield of back-to-back pairs in \dAu collisions is suppressed by up to an order of magnitude relative to \pp collisions, and increases with greater nuclear path thickness and with a selection for lower x in the Au nucleus.

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