Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-09-11
Physics
Nuclear Physics
Nuclear Theory
12 Pages, 8 Figures
Scientific paper
The success of nonviscous hydrodynamics in describing the collective flow properties of bulk low $p_\perp$ observables at RHIC has led to the claim that a novel form of {\it strongly coupled} Quark Gluon Plasma (sQGP) is created in 200 AGeV Au+Au collisions. This success depends strongly, however, on the initial conditions assumed in the calculations. In particular, agreement with data is only obtained assuming Glauber nuclear reaction plane (participant) geometry. The KLN model of Color Glass Condenstate (CGC) initial conditions require the existence of nonvanishing viscous effects. We develop an improved model of CGC that is more internally consistent between the central and diffuse edge regions. The improved model is shown to describe bulk rapidity distributions for a wide assortment of system sizes, geometries and energies. The self consistency forces a specific $\sqrt{s}$ dependence of the multiplicity which leads to surprisingly low particle production predictions for Pb+Pb collisions at LHC COM energies. These predictions are similar to those made using simple linear extrapolations of multiplicity attempted by the PHOBOS collaboration.
Adil Azfar
Gyulassy Miklos
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