Observation of an Energy-Dependent Difference in Elliptic Flow between Particles and Antiparticles in Relativistic Heavy Ion Collisions - INSPIRE

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Observation of an Energy-Dependent Difference in Elliptic Flow between Particles and Antiparticles in Relativistic Heavy Ion Collisions

STAR

Collaboration

Jan, 2013

7 pages

Published in:

Phys.Rev.Lett. 110 (2013) 14, 142301

Published: Apr 2, 2013

e-Print:

1301.2347 [nucl-ex]

DOI:

10.1103/PhysRevLett.110.142301

Experiments:

BNL-RHIC-STAR

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Abstract: (APS)

Elliptic flow (v2) values for identified particles at midrapidity in Au+Au collisions, measured by the STAR experiment in the beam energy scan at RHIC at sNN=7.7–62.4 GeV, are presented. A beam-energy-dependent difference of the values of v2 between particles and corresponding antiparticles was observed. The difference increases with decreasing beam energy and is larger for baryons compared to mesons. This implies that, at lower energies, particles and antiparticles are not consistent with the universal number-of-constituent-quark scaling of v2 that was observed at sNN=200 GeV.

25.75.Nq
25.75.Ld
heavy ion: scattering
particle antiparticle
hadron: elliptic flow
Brookhaven RHIC Coll
energy dependence
scaling
baryon
meson

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