Measurement of elliptic flow of light nuclei at √sNN = 200, 62.4, 39, 27, 19.6, 11.5, and 7.7 GeV at RHIC

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We present measurements of 2ⁿᵈ order azimuthal anisotropy (v₂) at mid-rapidity $(|y|<1.0)$ for light nuclei d, t, ³He (for √sNN = 200, 62.4, 39, 27, 19.6, 11.5, and 7.7 GeV) and anti-nuclei d̄ (√sNN = 200, 62.4, 39, 27, and 19.6 GeV) and ³ Hē (√sNN = 200 GeV) in the STAR (Solenoidal Tracker at RHIC) experiment. The v₂ for these light nuclei produced in heavy-ion collisions is compared with those for p and p̄. We observe mass ordering in nuclei v₂(pT) at low transverse momenta (pT<2.0 GeV/c). We also find a centrality dependence of v₂ for d and d̄. The magnitude of v₂ for t and ³He agree within statistical errors. Light-nuclei v₂ are compared with predictions from a blast wave model. Atomic mass number (A) scaling of light-nuclei v₂(pT) seems to hold for pT/A < 1.5 GeV/c. Results on light-nuclei v₂ from a transport-plus-coalescence model are consistent with the experimental measurements.