Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2011-09-09
Physics
Nuclear Physics
Nuclear Experiment
To appear in the proceedings of Quark Matter 2011 (QM 2011), Annecy, France, 23-28 May 2011
Scientific paper
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 $\eta = 3.8$. 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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