Abstract
We present v2 measurements from Au+Au collisions at = 7.7, 11.5 and 39 GeV for identified hadrons (π, K, K0s, p, ϕ, Λ, Ξ) and light nuclei ( and 3He). For the first time, a significant difference in v2 between baryons and anti-baryons is observed. The difference increases with decreasing center-of-mass energy. A systematically lower ϕ-meson v2, compared to the other particles, is observed in the frame of the number-of-constituent quark scaling.
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