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Observation of an energy-dependent difference in elliptic flow between particles and anti-particles in relativistic heavy ion collisions
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 corre...
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Published in: | arXiv.org 2013-01 |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
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Online Access: | Get full text |
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Summary: | 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. |
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ISSN: | 2331-8422 |
DOI: | 10.48550/arxiv.1301.2347 |