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Beam-Energy and System-Size Dependence of Dynamical Net Charge Fluctuations

The STAR collaboration
Phys.Rev.C 79 (2009) 024906, 2009.

Abstract (data abstract)
We present measurements of net charge fluctuations in Au+Au collisions at $\sqrt{s_{NN}}$= 19.6, 62.4, 130, and 200 GeV, Cu+Cu collisions at $\sqrt{s_{NN}}$= 62.4, 200 GeV, and p+p collisions at $\sqrt{s}$= 200 GeV using the dynamical net charge fluctuations measure $\nu_{+−,dyn}$. We observe that the dynamical fluctuations are non-zero at all energies and exhibit a modest dependence on beam energy. A weak system size dependence is also observed. We examine the collision centrality dependence of the net charge fluctuations and find that dynamical net charge fluctuations violate 1/$N_{ch}$ scaling, but display approximate 1/$N_{part}$ scaling. We also study the azimuthal and rapidity dependence of the net charge correlation strength and observe strong dependence on the azimuthal angular range and pseudorapidity widths integrated to measure the correlation.

  • Figure 1

    Data from Figure 1

    10.17182/hepdata.98972.v1/t1

    (Color online) Dynamical net charge fluctuations, $\nu_{+−,dyn}$, of particles produced within pseudorapidity $|\eta|$ < 0.5, as function of the number...

  • Figure 2

    Data from Figure 2

    10.17182/hepdata.98972.v1/t2

    (Color online) Corrected values of dynamical net charge fluctuations ($\nu^{corr}_{+−,dyn}$) as a function of $\sqrt{s_{NN}}$. See text for details.

  • Figure 3 a

    Data from Figure 3 a

    10.17182/hepdata.98972.v1/t3

    (Color online) Dynamical net charge fluctuations, $\nu_{+−,dyn}$, of particles produced with pseudorapidity $|\eta|$ < 0.5 scaled by (a) the multiplicity,...

  • Figure 3 b

    Data from Figure 3 b

    10.17182/hepdata.98972.v1/t4

    (Color online) Dynamical net charge fluctuations, $\nu_{+−,dyn}$, of particles produced with pseudorapidity $|\eta|$ < 0.5 scaled by (a) the multiplicity,...

  • Figure 3 c

    Data from Figure 3 c

    10.17182/hepdata.98972.v1/t5

    (Color online) Dynamical net charge fluctuations, $\nu_{+−,dyn}$, of particles produced with pseudorapidity $|\eta|$ < 0.5 scaled by (a) the multiplicity,...

  • Figure 4 a

    Data from Figure 4 a

    10.17182/hepdata.98972.v1/t6

    (Color online) Dynamical fluctuations $\nu_{+−,dyn}$, normalized to their value for |$\eta$| < 1, as function of the integrated pseudorapidity range....

  • Figure 4 b

    Data from Figure 4 b

    10.17182/hepdata.98972.v1/t7

    (Color online) Dynamical fluctuations $\nu_{+−,dyn}$, normalized to their value for |$\eta$| < 1, as function of the integrated pseudorapidity range....

  • Figure 5 a

    Data from Figure 5 a

    10.17182/hepdata.98972.v1/t8

    (Color online) Dynamical fluctuations $\nu_{+−,dyn}$, as a function of the integrated azimuthal range $\phi$ for selected collision centralities for (a)...

  • Figure 5 b

    Data from Figure 5 b

    10.17182/hepdata.98972.v1/t9

    (Color online) Dynamical fluctuations $\nu_{+−,dyn}$, as a function of the integrated azimuthal range $\phi$ for selected collision centralities for (a)...

  • Figure 6

    Data from Figure 6

    10.17182/hepdata.98972.v1/t10

    (Color online) Dynamical fluctuations $\nu_{+−,dyn}$, as a function of the integrated azimuthal range $\phi$ for similar number of participating nucleons...

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