Collapse of Flow: Probing the Order of the Phase Transition

Details Collapse of Flow: Probing the Order of the Phase Transition Collapse of Flow: Probing the Order of the Phase Transition

2007-10-26

arxiv.org/abs/0710.5089v1

PoSCPOD07:025,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 10 figures, To appear in the proceedings of 4rd International Workshop of Critical Point and Onset of Deconfinement

Scientific paper

We discuss the present collective flow signals for the phase transition to the quark-gluon plasma (QGP) and the collective flow as a barometer for the equation of state (EoS). We emphasize the importance of the flow excitation function from 1 to $50 A$ GeV: here the hydrodynamic model has predicted the collapse of the $v_1$-flow at $\sim 10 A$ GeV and of the $v_2$-flow at $\sim 40 A$ GeV. In the latter case, this has recently been observed by the NA49 collaboration. Since hadronic rescattering models predict much larger flow than observed at this energy, we interpret this observation as potential evidence for a first order phase transition at high baryon density $\rho_B$.

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