Collapse of Flow: Probing the Order of the Phase Transition
Abstract
Description
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 $ρ_B$.
12 pages, 10 figures, To appear in the proceedings of 4rd International Workshop of Critical Point and Onset of Deconfinement 2007
12 pages, 10 figures, To appear in the proceedings of 4rd International Workshop of Critical Point and Onset of Deconfinement 2007