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Charge-dependent directed flow in Cu+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV

The collaboration
Phys.Rev.Lett. 118 (2017) 012301, 2017

Abstract
We present the first measurement of charge-dependent directed flow in Cu+Au collisions at sNN=200  GeV. The results are presented as a function of the particle transverse momentum and pseudorapidity for different centralities. A finite difference between the directed flow of positive and negative charged particles is observed that qualitatively agrees with the expectations from the effects of the initial strong electric field between two colliding ions with different nuclear charges. The measured difference in directed flow is much smaller than that obtained from the parton-hadron-string-dynamics model, which suggests that most of the electric charges, i.e., quarks and antiquarks, have not yet been created during the lifetime of the strong electric field, which is of the order of, or less than, 1  fm/c.

• #### Table 1

Data from Figure 2 (panel a)

10.17182/hepdata.77581.v1/t1

$p_{\rm T}$ dependence of directed flow in centrality 10-20%.

• #### Table 2

Data from Figure 2 (panel b)

10.17182/hepdata.77581.v1/t2

$p_{\rm T}$ dependence of directed flow in centrality 20-30%.

• #### Table 3

Data from Figure 2 (panel c)

10.17182/hepdata.77581.v1/t3

$p_{\rm T}$ dependence of directed flow in centrality 30-40%.

• #### Table 4

Data from Figure 2 (panel d)

10.17182/hepdata.77581.v1/t4

$p_{\rm T}$ dependence of directed flow in centrality 40-50%.

• #### Table 5

Data from Figure 2 (panel e)

10.17182/hepdata.77581.v1/t5

$p_{\rm T}$ dependence of directed flow in centrality 50-60%.

• #### Table 6

Data from Figure 2 (panel f)

10.17182/hepdata.77581.v1/t6

$p_{\rm T}$ dependence of Delta v1 in centrality 10-20%.

• #### Table 7

Data from Figure 2 (panel g)

10.17182/hepdata.77581.v1/t7

$p_{\rm T}$ dependence of Delta v1 in centrality 20-30%.

• #### Table 8

Data from Figure 2 (panel h)

10.17182/hepdata.77581.v1/t8

$p_{\rm T}$ dependence of Delta v1 in centrality 30-40%.

• #### Table 9

Data from Figure 2 (panel i)

10.17182/hepdata.77581.v1/t9

$p_{\rm T}$ dependence of Delta v1 in centrality 40-50%.

• #### Table 10

Data from Figure 2 (panel j)

10.17182/hepdata.77581.v1/t10

$p_{\rm T}$ dependence of Delta v1 in centrality 50-60%.

• #### Table 11

Data from Figure 3 (panel a)

10.17182/hepdata.77581.v1/t11

$p_{\rm T}$ dependence of directed flow in centrality 10-40%.

• #### Table 12

Data from Figure 3 (panel a)

10.17182/hepdata.77581.v1/t12

$p_{\rm T}$ dependence of directed flow in centrality 10-40%.

• #### Table 13

Data from Figure 3 (panel b)

10.17182/hepdata.77581.v1/t13

$p_{\rm T}$ dependence of Delat v1 in centrality 10-40%.

• #### Table 14

Data from Figure 3 (panel a)

10.17182/hepdata.77581.v1/t14

$p_{\rm T}$ dependence of directed flow in centrality 10-40%.

• #### Table 15

Data from Figure 4 (panel a)

10.17182/hepdata.77581.v1/t15

eta dependence of directed flow in centrality 10-40%.

• #### Table 16

Data from Figure 4 (panel b)

10.17182/hepdata.77581.v1/t16

eta dependence of Delta v1 in centrality 10-40%.