Beam-Energy Dependence of the Directed Flow of Protons, Antiprotons, and Pions in Au+Au Collisions - INSPIRE

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Beam-Energy Dependence of the Directed Flow of Protons, Antiprotons, and Pions in Au+Au Collisions

STAR

Collaboration

Jan 13, 2014

7 pages

Published in:

Phys.Rev.Lett. 112 (2014) 16, 162301

Published: Apr 23, 2014

e-Print:

1401.3043 [nucl-ex]

DOI:

10.1103/PhysRevLett.112.162301

Experiments:

BNL-RHIC-STAR

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Abstract: (APS)

Rapidity-odd directed flow (v1) measurements for charged pions, protons, and antiprotons near midrapidity (y=0) are reported in sNN=7.7, 11.5, 19.6, 27, 39, 62.4, and 200 GeV Au+Au collisions as recorded by the STAR detector at the Relativistic Heavy Ion Collider. At intermediate impact parameters, the proton and net-proton slope parameter dv1/dy|y=0 shows a minimum between 11.5 and 19.6 GeV. In addition, the net-proton dv1/dy|y=0 changes sign twice between 7.7 and 39 GeV. The proton and net-proton results qualitatively resemble predictions of a hydrodynamic model with a first-order phase transition from hadronic matter to deconfined matter, and differ from hadronic transport calculations.

Note:

Post-referee version, accepted by PRL. Fig. 2 now includes panels for 62.4 and 200 GeV

25.75.Ld
25.75.Dw
p: flow
matter: hadronic
model: hydrodynamics
heavy ion: scattering
anti-p
flow
gold
Brookhaven RHIC Coll

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