Here we report on a study of the transverse momentum dependence of nuclear modification factors RdAu for charged hadrons produced in deuteron + gold collisions at $\sqrt{^SNN}$ = 200 GeV, as a ...function of collision centrality and of the pseudorapidity (η = 0, 1, 2.2, 3.2) of the produced hadrons. We find a significant and systematic decrease of RdAu with increasing rapidity. The midrapidity enhancement and the forward rapidity suppression are more pronounced in central collisions relative to peripheral collisions. These results are relevant to the study of the possible onset of gluon saturation at energies reached at BNL RHIC
We report on a study of the transverse momentum dependence of nuclear modification factors R(dAu) for charged hadrons produced in deuteron + gold collisions at sqrts(NN)=200 GeV, as a function of ...collision centrality and of the pseudorapidity (eta=0, 1, 2.2, 3.2) of the produced hadrons. We find a significant and systematic decrease of R(dAu) with increasing rapidity. The midrapidity enhancement and the forward rapidity suppression are more pronounced in central collisions relative to peripheral collisions. These results are relevant to the study of the possible onset of gluon saturation at energies reached at BNL RHIC.
The forward high $p_{\rm T}$ puzzle Gaardhøje, J. J.
The European physical journal. C, Particles and fields,
08/2005, Volume:
43, Issue:
1-4
Journal Article
Heavy ion collisions at RHIC energies (Au + Au collisions at
√S
NN = 200GeV
) exhibit significant new features as compared to earlier experiments at lower energies. The reaction is characterized by a ...high degree of transparency of the collision partners leading to the formation of a baryon-poor central region. In this zone, particle production occurs mainly from the stretching of the color field. The initial energy density is well above the one considered necessary for the formation of the Quark Gluon Plasma, QGP. The production of charged particles of various masses is consistent with chemical and thermal equilibrium. Recently, a suppression of the high transverse momentum component of hadron spectra has been observed in central Au + Au collisions. This can be explained by the energy loss experienced by leading partons in a medium with a high density of unscreened color charges. In contrast, such high
p
t
jets are not suppressed in d + Au collisions suggesting that the high
p
t
suppression is not due to initial state effects in the ultrarelativistic colliding nuclei.
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