2009

Observation of charge-dependent azimuthal correlations and possible local strong parity violation in heavy ion collisions

STAR Collaboration, Abelev, B. I.

Understand

Parity-odd domains, corresponding to non-trivial topological solutions of the QCD vacuum, might be created during relativistic heavy-ion collisions.

These domains are predicted to lead to charge separation of quarks along the orbital momentum of the system created in non-central collisions.
To study this effect, we investigate a three particle mixed harmonics azimuthal correlator which is a \P-even observable, but directly sensitive to the charge separation effect.
We report measurements of this observable using the STAR detector in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$=200 and 62~GeV.

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