Fluctuations of charge separation perpendicular to the event plane and local parity violation in $\sqrt{s_{NN}}=200$ GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider

The collaboration
Phys.Rev.C 88 (2013) 064911, 2013.

Abstract (data abstract)
Previous experimental results based on data (~ 15 million events) collected by the STAR detector at RHIC suggest event-by-event charge separation fluctuations perpendicular to the event plane in non-central heavy-ion collisions. Here we present the correlator previously used split into its two component parts to reveal correlations parallel and perpendicular to the event plane. The results are from a high statistics 200 GeV Au+Au collisions data set (57 million events) collected by the STAR experiment. We explicitly count units of charge separation from which we find clear evidence for more charge separation fluctuations perpendicular than parallel to the event plane. We also employ a modified correlator to study the possible P-even background in same and opposite charge correlations, and find that the P-even background may largely be explained by momentum conservation and collective motion.

• Figure 3

Data from Figure 3

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(Color online) $\Delta RMS^{\Delta Q}/\langle RMS^{\Delta Q}\rangle$ versus centrality for Au+Au collisions at $\sqrt{s_{NN}}$= 200 GeV. Not corrected for event...

• Figure 4

Data from Figure 4

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(Color online) $\langle sin(\phi_{\alpha} − \Psi_{1})\rangle$ for positive and negative charges versus centrality for Au+Au collisions at $\sqrt{s_{NN}}$= 200 GeV....

• Figure 5

Data from Figure 5

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(Color online) Three-point correlator, Eq. 1, measured with $1^{st}$ and $2^{nd}$ harmonic event planes versus centrality for Au+Au collisions at...

• Figure 6

Data from Figure 6

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(Color online) Modulated sign correlations (msc) compared to the three-point correlator versus centrality for Au+Au collisions at $\sqrt{s_{NN}}$= 200 GeV....

• Figure 7 a

Data from Figure 7 a

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(Color online) The msc split into 2 composite parts versus centrality for Au+Au collisions at $\sqrt{s_{NN}}$= 200 GeV. Shaded areas...

• Figure 7 b

Data from Figure 7 b

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(Color online) The msc split into 2 composite parts versus centrality for Au+Au collisions at $\sqrt{s_{NN}}$= 200 GeV. Shaded areas...

• Figure 8 a

Data from Figure 8 a

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(Color online) Three-point correlations split up into out-of-plane $(\langle sin(\Delta\phi_{\alpha}) sin(\Delta\phi_{\beta})\rangle)$ and in-plane $(\langle cos(\Delta\phi_{\alpha}) cos(\Delta\phi_{\beta})\rangle)$ composite parts for 40...

• Figure 8 b

Data from Figure 8 b

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(Color online) Three-point correlations split up into out-of-plane $(\langle sin(\Delta\phi_{\alpha}) sin(\Delta\phi_{\beta})\rangle)$ and in-plane $(\langle cos(\Delta\phi_{\alpha}) cos(\Delta\phi_{\beta})\rangle)$ composite parts for 40...

• Figure 9 a

Data from Figure 9 a

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(Color online) Three-point correlations split up into out-of-plane and in-plane composite parts for 40 − 60% Au+Au collisions at $\sqrt{s_{NN}}$=...

• Figure 9 b

Data from Figure 9 b

10.17182/hepdata.98967.v1/t10

(Color online) Three-point correlations split up into out-of-plane and in-plane composite parts for 40 − 60% Au+Au collisions at $\sqrt{s_{NN}}$=...