Jansen, D.M.
STAR
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Charge-dependent directed flow in Cu+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV

The STAR collaboration Adamczyk, L. ; Adkins, J.K. ; Agakishiev, G. ; et al.
Phys.Rev.Lett. 118 (2017) 012301, 2017.
Inspire Record 1481225 DOI 10.17182/hepdata.77581

We present the first measurement of charge-dependent directed flow in Cu+Au collisions at $\sqrt{s_{_{NN}}}$ = 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 (PHSD) 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, 1fm/$c$.

16 data tables
Table 1

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

Table 2

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

Table 3

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

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Direct virtual photon production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

The STAR collaboration Adamczyk, L. ; Adkins, J.K. ; Agakishiev, G. ; et al.
Phys.Lett.B 770 (2017) 451-458, 2017.
Inspire Record 1474129 DOI 10.17182/hepdata.77495

We report the direct virtual photon invariant yields in the transverse momentum ranges $1\!<\!p_{T}\!<\!3$ GeV/$c$ and $5\!<\!p_T\!<\!10$ GeV/$c$ at mid-rapidity derived from the dielectron invariant mass continuum region $0.106$ GeV/$c$ the production follows $N_{bin}$ scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent within uncertainties with the direct virtual photon invariant yield.

22 data tables
Table 1

Dielectron invariant mass spectra in 1.0-1.5 GeV/c.

Table 2

Dielectron invariant mass spectra in 1.5-2.0 GeV/c.

Table 3

Dielectron invariant mass spectra in 2.0-2.5 GeV/c.

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