# Observation of an energy-dependent difference in elliptic flow between particles and anti-particles in relativistic heavy ion collisions

Abstract : Elliptic flow ($v_{2}$) values for identified particles at mid-rapidity in Au+Au collisions, measured by the STAR experiment in the Beam Energy Scan at RHIC at $\sqrt{s_{NN}}=$ 7.7--62.4 GeV, are presented. A beam-energy dependent difference of the values of $v_{2}$ between particles and corresponding anti-particles 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 anti-particles are not consistent with the universal number-of-constituent-quark (NCQ) scaling of $v_{2}$ that was observed at $\sqrt{s_{NN}}=$ 200 GeV.
Document type :
Journal articles

https://hal.in2p3.fr/in2p3-00807108
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Submitted on : Wednesday, April 3, 2013 - 7:28:16 AM
Last modification on : Wednesday, April 27, 2022 - 3:46:19 AM

### Citation

L. Adamczyk, W. Borowski, S. Kabana. Observation of an energy-dependent difference in elliptic flow between particles and anti-particles in relativistic heavy ion collisions. Physical Review Letters, American Physical Society, 2013, 110, pp.142301. ⟨10.1103/PhysRevLett.110.142301⟩. ⟨in2p3-00807108⟩

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