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

The collaboration
Phys.Rev.C 91 (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

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Multiplicity distributions of raw charged particles and photons.

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Data from Figure 2a

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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.

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Data from Figure 2a

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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.

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Data from Figure 2b

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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.

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Data from Figure 2b

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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.

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Data from Figure 2c

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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.

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Data from Figure 2c

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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.

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Data from Figure 2d

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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.

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Data from Figure 2d

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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.

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Data from Figure 3a

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

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Data from Figure 3a

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

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Data from Figure 3b

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

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Data from Figure 3b

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

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Data from Figure 4

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

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Data from Figure 5a

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

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Data from Figure 5a

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

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Data from Figure 5b

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

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Data from Figure 5b

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

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Data from Figure 5c

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

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Data from Figure 5c

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

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Data from Figure 6

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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...