Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2009-07-18
Phys.Rev.C80:051902,2009
Physics
Nuclear Physics
Nuclear Theory
5 pages, 4 figures, version accepted in PRC
Scientific paper
10.1103/PhysRevC.80.051902
We show that the event-by-event fluctuations of the transverse size of the initial source, which follow directly from the Glauber treatment of the earliest stage of relativistic heavy-ion collisions, cause, after hydrodynamic evolution, fluctuations of the transverse flow velocity at hadronic freeze-out. This in turn leads to event-by-event fluctuations of the average transverse momentum, p_T. Simulations with GLISSANDO for the Glauber phase, followed by a realistic hydrodynamic evolution and statistical hadronization carried out with THERMINATOR, lead to agreement with the RHIC data. In particular, the magnitude of the effect, its centrality dependence, and the weak dependence on the incident energy are properly reproduced. Our results show that bulk of the observed event-by-event p_T fluctuations may be explained by the fluctuations of the size of the initial source.
Broniowski Wojciech
Chojnacki Mikolaj
Obara Lukasz
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