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Measurement of elliptic flow of light nuclei at $\sqrt{s_{NN}}=$ 200, 62.4, 39, 27, 19.6, 11.5, and 7.7 GeV at the BNL Relativistic Heavy Ion Collider

The STAR collaboration
Phys.Rev.C 94 (2016) 034908, 2016.

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

  • Figure 4(a)

    10.17182/hepdata.104505.v1/t1

    Mid-rapidity v2(pT) for d,anti-d,t,He,anti-He from minimum bias (0-80%) Au+Au collisions 200 GeV (d data points are also shown in Fig...

  • Figure 4(b)

    10.17182/hepdata.104505.v1/t2

    Mid-rapidity v2(pT) for d,anti-d,t,He from minimum bias (0-80%) Au+Au collisions 62.4 GeV.

  • Figure 4(c)

    10.17182/hepdata.104505.v1/t3

    Mid-rapidity v2(pT) for d,anti-d,t,He from minimum bias (0-80%) Au+Au collisions 39 GeV.

  • Figure 4(d)

    10.17182/hepdata.104505.v1/t4

    Mid-rapidity v2(pT) for d,anti-d,t,He from minimum bias (0-80%) Au+Au collisions 27 GeV.

  • Figure 4(e)

    10.17182/hepdata.104505.v1/t5

    Mid-rapidity v2(pT) for d,anti-d,t,He from minimum bias (0-80%) Au+Au collisions 19.6 GeV.

  • Figure 4(f)

    10.17182/hepdata.104505.v1/t6

    Mid-rapidity v2(pT) for d,t,He from minimum bias (0-80%) Au+Au collisions 11.5 GeV.

  • Figure 4(g)

    10.17182/hepdata.104505.v1/t7

    Mid-rapidity v2(pT) for d,t,He from minimum bias (0-80%) Au+Au collisions 7.7 GeV.

  • Figure 6(a)

    10.17182/hepdata.104505.v1/t8

    Mid-rapidity v2(pT) difference for d-dbar in minimum bias (0-80%) Au+Au collisions 200 GeV.

  • Figure 6(b)

    10.17182/hepdata.104505.v1/t9

    Mid-rapidity v2(pT) difference for d-dbar in minimum bias (0-80%) Au+Au collisions 62.4 GeV.

  • Figure 6(c)

    10.17182/hepdata.104505.v1/t10

    Mid-rapidity v2(pT) difference for d-dbar in minimum bias (0-80%) Au+Au collisions 39 GeV.

  • Figure 6(d)

    10.17182/hepdata.104505.v1/t11

    Mid-rapidity v2(pT) difference for d-dbar in minimum bias (0-80%) Au+Au collisions 27 GeV.

  • Figure 6(e)

    10.17182/hepdata.104505.v1/t12

    Mid-rapidity v2(pT) difference for d-dbar in minimum bias (0-80%) Au+Au collisions 19.6 GeV.

  • Figure 7(a)

    10.17182/hepdata.104505.v1/t13

    Mid-rapidity v2(pT) for d and anti-d for 0-10%, 10-40% and 40-80% in Au+Au collisions 200 GeV.

  • Figure 7(b)

    10.17182/hepdata.104505.v1/t14

    Mid-rapidity v2(pT) for d and anti-d for 0-30% and 30-80% in Au+Au collisions 62.4 GeV.

  • Figure 7(c)

    10.17182/hepdata.104505.v1/t15

    Mid-rapidity v2(pT) for d and anti-d for 0-30% and 30-80% in Au+Au collisions 39 GeV.

  • Figure 7(d)

    10.17182/hepdata.104505.v1/t16

    Mid-rapidity v2(pT) for d and anti-d for 0-30% and 30-80% in Au+Au collisions 27 GeV.

  • Figure 7(e)

    10.17182/hepdata.104505.v1/t17

    Mid-rapidity v2(pT) for d 0-30% and 30-80% in Au+Au collisions 19.6 GeV.

  • Figure 7(f)

    10.17182/hepdata.104505.v1/t18

    Mid-rapidity v2(pT) for d 0-30% and 30-80% in Au+Au collisions 11.5 GeV.

  • Figure 7(g)

    10.17182/hepdata.104505.v1/t19

    Mid-rapidity v2(pT) for d 0-30% and 30-80% in Au+Au collisions 7.7 GeV.

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