Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2011-01-06
Physics
Nuclear Physics
Nuclear Theory
Talk given at the Gribov-80 Memorial Workshop, May 26-28, 2010 ICTP Trieste, Italy. 12 pages, 5 figures. This work was support
Scientific paper
A 1+3 dimensional solution of relativistic hydrodynamics is analyzed in this paper. Momentum distribution and other observables are calculated from the solution and compared to hadronic measurements from the Relativistic Heavy Ion Collider (RHIC). The solution is compatible with the data, but only the freeze-out point of the evolution is determined. Many equation of states and initial states (initial temperatures) are valid with the same freeze-out distribution, thus the same hadronic observables. The observable that would distinguish between these initial temperatures is momentum distribution of photons, as photons are created throughout the evolution of the fireball created in RHIC collisions. The PHENIX experiment at RHIC measures such data via low invariant mass e+e- pairs. Average temperature from this data is T=221+-23+-18 MeV, while a model calculation with initial temperature 370 MeV agree with the data.
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