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Beam-energy dependence of charge separation along the magnetic field in Au+Au collisions at RHIC

The STAR collaboration
Phys.Rev.Lett. 113 (2014) 052302, 2014

Abstract (data abstract)
BNL-RHIC. Local parity-odd domains are theorized to form inside a Quark-Gluon-Plasma (QGP) which has been produced in high-energy heavy-ion collisions. The local parity-odd domains manifest themselves as charge separation along the magnetic field axis via the chiral magnetic effect (CME). The experimental observation of charge separation has previously been reported for heavy-ion collisions at the top RHIC energies. In this paper, we present the results of the beam-energy dependence of the charge correlations in Au+Au collisions at midrapidity for center-of-mass energies of 7.7, 11.5, 19.6, 27, 39 and 62.4 GeV from the STAR experiment. After background subtraction, the signal gradually reduces with decreased beam energy, and tends to vanish by 7.7 GeV. The implications of these results for the CME will be discussed.

  • Table 1

    Data from Figure 2

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    The three-point correlator, $\gamma$, as a function of centrality for Au+Au collisions at 62.4 GeV.

  • Table 2

    Data from Figure 2

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    The three-point correlator, $\gamma$, as a function of centrality for Au+Au collisions at 39 GeV.

  • Table 3

    Data from Figure 2

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    The three-point correlator, $\gamma$, as a function of centrality for Au+Au collisions at 27 GeV.

  • Table 4

    Data from Figure 2

    10.17182/hepdata.73457.v1/t4

    The three-point correlator, $\gamma$, as a function of centrality for Au+Au collisions at 19.6 GeV.

  • Table 5

    Data from Figure 2

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    The three-point correlator, $\gamma$, as a function of centrality for Au+Au collisions at 11.5 GeV.

  • Table 6

    Data from Figure 2

    10.17182/hepdata.73457.v1/t6

    The three-point correlator, $\gamma$, as a function of centrality for Au+Au collisions at 7.7.

  • Table 7

    Data from Figure 3

    10.17182/hepdata.73457.v1/t7

    The two-particle correlation as a function of centrality for Au+Au collisions at 62.4 GeV.

  • Table 8

    Data from Figure 3

    10.17182/hepdata.73457.v1/t8

    The two-particle correlation as a function of centrality for Au+Au collisions at 39 GeV.

  • Table 9

    Data from Figure 3

    10.17182/hepdata.73457.v1/t9

    The two-particle correlation as a function of centrality for Au+Au collisions at 27 GeV.

  • Table 10

    Data from Figure 3

    10.17182/hepdata.73457.v1/t10

    The two-particle correlation as a function of centrality for Au+Au collisions at 19.6 GeV.

  • Table 11

    Data from Figure 3

    10.17182/hepdata.73457.v1/t11

    The two-particle correlation as a function of centrality for Au+Au collisions at 11.5 GeV.

  • Table 12

    Data from Figure 3

    10.17182/hepdata.73457.v1/t12

    The two-particle correlation as a function of centrality for Au+Au collisions at 7.7 GeV.

  • Table 13

    Data from Figure 4

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    $H_{SS}-H{OS}$, as a function of beam energy for 60-80% centrality in Au+Au collisions.

  • Table 14

    Data from Figure 4

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    $H_{SS}-H{OS}$, as a function of beam energy for 30-60% centrality in Au+Au collisions.

  • Table 15

    Data from Figure 4

    10.17182/hepdata.73457.v1/t15

    $H_{SS}-H{OS}$, as a function of beam energy for 10-30% centrality in Au+Au collisions.

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