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Directed flow in ultrarelativistic heavy-ion collisions

2010; American Institute of Physics; Volume: 81; Issue: 5 Linguagem: Inglês

10.1103/physrevc.81.054902

1538-4497

Piotr Bożek, Iwona Wyskiel,

Particle physics theoretical and experimental studies

We study the generation of directed flow in the hydrodynamic expansion of the hot matter formed in ultrarelativistic heavy-ion collisions at 200GeV. The experimentally observed negative directed flow in a wide range of central pseudorapidities isreproduced assuming that the fireball is tilted away from the collision axis. The tilt of the source is consistent with a preferential emission in the forward/backward hemisphere from forward/backward participating nucleons. The model reproduces the experimentally observed scaling of the directed flow when going from Au-Au to Cu-Cu systems.