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Charged-to-neutral correlation at forward rapidity in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV

The STAR collaboration
Phys.Rev. C91 (2015) 034905, 2015

Abstract (data abstract)
BNL-RHIC. Event-by-event fluctuations of the ratio of inclusive charged to photon multiplicities at forward rapidity in Au+Au collision at $\sqrt{s_{NN}}$=200 GeV have been studied. Dominant contribution to such fluctuations is expected to come from correlated production of charged and neutral pions. We search for evidences of dynamical fluctuations of different physical origins. Observables constructed out of moments of multiplicities are used as measures of fluctuations. Mixed events and model calculations are used as baselines. Results are compared to the dynamical net-charge fluctuations measured in the same acceptance. A non-zero statistically significant signal of dynamical fluctuations is observed in excess to the model prediction when charged particles and photons are measured in the same acceptance. We find that, unlike dynamical net-charge fluctuation, charge-neutral fluctuation is not dominated by correlation due to particle decay. Results are compared to the expectations based on the generic production mechanism of pions due to isospin symmetry, for which no significant (\langle 1%) deviation is observed.

  • Table 1

    Data from Figure 1

    10.17182/hepdata.73610.v1/t1

    Multiplicity distributions of raw charged particles and photons.

  • Table 2

    Data from Figure 2a

    10.17182/hepdata.73610.v1/t2

    The $v_{dyn}$ and the three terms of $v_{dyn}$ vs $\sqrt{\langle N_{ch}\rangle \langle N_{\gamma}\rangle }$ for real events. $\omega_{ch}^{real}$ is plotted.

  • Table 3

    Data from Figure 2a

    10.17182/hepdata.73610.v1/t3

    The $v_{dyn}$ and the three terms of $v_{dyn}$ vs $\sqrt{\langle N_{ch}\rangle \langle N_{\gamma}\rangle }$ for mixed events. $\omega_{ch}^{mixed}$ is plotted.

  • Table 4

    Data from Figure 2b

    10.17182/hepdata.73610.v1/t4

    The $v_{dyn}$ and the three terms of $v_{dyn}$ vs $\sqrt{\langle N_{ch}\rangle \langle N_{\gamma}\rangle }$ for mixed events. $Corr_{\gamma\,-ch}^{real}$ is plotted.

  • Table 5

    Data from Figure 2b

    10.17182/hepdata.73610.v1/t5

    The $v_{dyn}$ and the three terms of $v_{dyn}$ vs $\sqrt{\langle N_{ch}\rangle \langle N_{\gamma}\rangle }$ for mixed events. $Corr_{\gamma\,-ch}^{mixed}$ is plotted.

  • Table 6

    Data from Figure 2c

    10.17182/hepdata.73610.v1/t6

    The $v_{dyn}$ and the three terms of $v_{dyn}$ vs $\sqrt{\langle N_{ch}\rangle \langle N_{\gamma}\rangle }$ for mixed events. $\omega_{\gamma}^{real}$ is plotted.

  • Table 7

    Data from Figure 2c

    10.17182/hepdata.73610.v1/t7

    The $v_{dyn}$ and the three terms of $v_{dyn}$ vs $\sqrt{\langle N_{ch}\rangle \langle N_{\gamma}\rangle }$ for mixed events. $\omega_{\gamma}^{mixed}$ is plotted.

  • Table 8

    Data from Figure 2d

    10.17182/hepdata.73610.v1/t8

    The $v_{dyn}$ and the three terms of $v_{dyn}$ vs $\sqrt{\langle N_{ch}\rangle \langle N_{\gamma}\rangle }$ for mixed events. $v_{dyn}^{real}$ is plotted.

  • Table 9

    Data from Figure 2d

    10.17182/hepdata.73610.v1/t9

    The $v_{dyn}$ and the three terms of $v_{dyn}$ vs $\sqrt{\langle N_{ch}\rangle \langle N_{\gamma}\rangle }$ for mixed events. $v_{dyn}^{mixed}$ is plotted.

  • Table 10

    Data from Figure 3a

    10.17182/hepdata.73610.v1/t10

    The values of the observable $v_{dyn}^{ch-\gamma}$ for the same side.

  • Table 11

    Data from Figure 3a

    10.17182/hepdata.73610.v1/t11

    The values of the observable $v_{dyn}^{ch-\gamma}$ for the same side.

  • Table 12

    Data from Figure 3b

    10.17182/hepdata.73610.v1/t12

    The values of the observable $v_{dyn}^{ch-\gamma}$ for the away-side.

  • Table 13

    Data from Figure 3b

    10.17182/hepdata.73610.v1/t13

    The values of the observable $v_{dyn}^{ch-\gamma}$ for the away-side.

  • Table 14

    Data from Figure 4

    10.17182/hepdata.73610.v1/t14

    The correlation between positive and negative charged particles measured by the FTPC and photons measured by the PMD using $v_{dyn}$...

  • Table 15

    Data from Figure 5a

    10.17182/hepdata.73610.v1/t15

    $r_{m,1}$ vs multiplicity for first order of m.

  • Table 16

    Data from Figure 5a

    10.17182/hepdata.73610.v1/t16

    $r_{m,1}$ vs multiplicity for first order of m.

  • Table 17

    Data from Figure 5b

    10.17182/hepdata.73610.v1/t17

    $r_{m,1}$ vs multiplicity for second order of m.

  • Table 18

    Data from Figure 5b

    10.17182/hepdata.73610.v1/t18

    $r_{m,1}$ vs multiplicity for second order of m.

  • Table 19

    Data from Figure 5c

    10.17182/hepdata.73610.v1/t19

    $r_{m,1}$ vs multiplicity for third order of m.

  • Table 20

    Data from Figure 5c

    10.17182/hepdata.73610.v1/t20

    $r_{m,1}$ vs multiplicity for third order of m.

  • Table 21

    Data from Figure 6

    10.17182/hepdata.73610.v1/t21

    The moments $r_{m,1}$(m=1-3) for real and mixed events as a function of order m in a fixed multiplicity bin of...

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