Beam-energy dependence of charge balance functions from Au + Au collisions at energies available at the BNL Relativistic Heavy Ion Collider

The collaboration
Phys.Rev.C 94 (2016) 024909, 2016.

Abstract
Balance functions have been measured in terms of relative pseudorapidity ($\Delta \eta$) for charged particle pairs at the Relativistic Heavy-Ion Collider (RHIC) from Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 7.7 GeV to 200 GeV using the STAR detector. These results are compared with balance functions measured at the Large Hadron Collider (LHC) from Pb+Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV by the ALICE Collaboration. The width of the balance function decreases as the collisions become more central and as the beam energy is increased. In contrast, the widths of the balance functions calculated using shuffled events show little dependence on centrality or beam energy and are larger than the observed widths. Balance function widths calculated using events generated by UrQMD are wider than the measured widths in central collisions and show little centrality dependence. The measured widths of the balance functions in central collisions are consistent with the delayed hadronization of a deconfined quark gluon plasma (QGP). The narrowing of the balance function in central collisions at $\sqrt{s_{\rm NN}}$ = 7.7 GeV implies that a QGP is still being created at this relatively low energy.

• #### Figure 1 (7.7 GeV)

10.17182/hepdata.99053.v1/t1

The balance function in terms of $\Delta \eta$ for all charged particles with $0.2 < p_{T} < 2.0$ GeV/$c$ from...

• #### Figure 1 (11.5 GeV)

10.17182/hepdata.99053.v1/t2

The balance function in terms of $\Delta \eta$ for all charged particles with $0.2 < p_{T} < 2.0$ GeV/$c$ from...

• #### Figure 1 (19.6 GeV)

10.17182/hepdata.99053.v1/t3

The balance function in terms of $\Delta \eta$ for all charged particles with $0.2 < p_{T} < 2.0$ GeV/$c$ from...

• #### Figure 1 (27 GeV)

10.17182/hepdata.99053.v1/t4

The balance function in terms of $\Delta \eta$ for all charged particles with $0.2 < p_{T} < 2.0$ GeV/$c$ from...

• #### Figure 1 (39 GeV)

10.17182/hepdata.99053.v1/t5

The balance function in terms of $\Delta \eta$ for all charged particles with $0.2 < p_{T} < 2.0$ GeV/$c$ from...

• #### Figure 1 (62.4 GeV)

10.17182/hepdata.99053.v1/t6

The balance function in terms of $\Delta \eta$ for all charged particles with $0.2 < p_{T} < 2.0$ GeV/$c$ from...

• #### Figure 1 (200 GeV)

10.17182/hepdata.99053.v1/t7

The balance function in terms of $\Delta \eta$ for all charged particles with $0.2 < p_{T} < 2.0$ GeV/$c$ from...

• #### Figure 2 (7.7 GeV)

10.17182/hepdata.99053.v1/t8

Energy dependence of the balance function widths compared with the widths of the balance functions calculated using shuffled events. Also...

• #### Figure 2 (11.5 GeV)

10.17182/hepdata.99053.v1/t9

Energy dependence of the balance function widths compared with the widths of the balance functions calculated using shuffled events. Also...

• #### Figure 2 (19.6 GeV)

10.17182/hepdata.99053.v1/t10

Energy dependence of the balance function widths compared with the widths of the balance functions calculated using shuffled events. Also...

• #### Figure 2 (27 GeV)

10.17182/hepdata.99053.v1/t11

Energy dependence of the balance function widths compared with the widths of the balance functions calculated using shuffled events. Also...

• #### Figure 2 (39 GeV)

10.17182/hepdata.99053.v1/t12

Energy dependence of the balance function widths compared with the widths of the balance functions calculated using shuffled events. Also...

• #### Figure 2 (62.4 GeV)

10.17182/hepdata.99053.v1/t13

Energy dependence of the balance function widths compared with the widths of the balance functions calculated using shuffled events. Also...

• #### Figure 2 (200 GeV)

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Energy dependence of the balance function widths compared with the widths of the balance functions calculated using shuffled events. Also...

• #### Figure 3

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Balance function widths for the most central events ($0-5\%$) compared with balance function widths calculated using shuffled events. Also shown...

• #### Figure 4 (7.7 GeV)

10.17182/hepdata.99053.v1/t16

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ compared with similar results...

• #### Figure 4 (11.5 GeV)

10.17182/hepdata.99053.v1/t17

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ compared with similar results...

• #### Figure 4 (19.6 GeV)

10.17182/hepdata.99053.v1/t18

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ compared with similar results...

• #### Figure 4 (27 GeV)

10.17182/hepdata.99053.v1/t19

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ compared with similar results...

• #### Figure 4 (39 GeV)

10.17182/hepdata.99053.v1/t20

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ compared with similar results...

• #### Figure 4 (62.4 GeV)

10.17182/hepdata.99053.v1/t21

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ compared with similar results...

• #### Figure 4 (200 GeV)

10.17182/hepdata.99053.v1/t22

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ compared with similar results...

• #### Figure 4 (2.76 TeV ALICE)

10.17182/hepdata.99053.v1/t23

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ compared with similar results...

• #### Figure 5 (7.7 GeV)

10.17182/hepdata.99053.v1/t24

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ normalized to the most...

• #### Figure 5 (11.5 GeV)

10.17182/hepdata.99053.v1/t25

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ normalized to the most...

• #### Figure 5 (19.6 GeV)

10.17182/hepdata.99053.v1/t26

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ normalized to the most...

• #### Figure 5 (27 GeV)

10.17182/hepdata.99053.v1/t27

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ normalized to the most...

• #### Figure 5 (39 GeV)

10.17182/hepdata.99053.v1/t28

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ normalized to the most...

• #### Figure 5 (62.4 GeV)

10.17182/hepdata.99053.v1/t29

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ normalized to the most...

• #### Figure 5 (200 GeV)

10.17182/hepdata.99053.v1/t30

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ normalized to the most...

• #### Figure 5 (2.76 TeV ALICE)

10.17182/hepdata.99053.v1/t31

Acceptance-corrected balance function widths for Au+Au measured over the range $0.1 < \Delta \eta < 1.6$ normalized to the most...