It has been suggested that local parity violation (LPV) in Quantum
Chromodynamics (QCD) would lead to charge separation of quarks by
the Chiral Magnetic Effect (CME) in heavy ion collisions. Charge
Multiplicity Asymmetry Correlation Study Searching for Local Parity
Violation at RHIC for STAR Collaboration presents the detailed
study of charge separation with respect to the event plane. Results
on charge multiplicity asymmetry in Au+Au and d+Au collisions at
200 GeV by the STAR experiment are reported. It was found that the
correlation results could not be explained by CME alone.
Additionally, the charge separation signal as a function of the
measured azimuthal angle range as well as the event-by-event
anisotropy parameter are studied. These results indicate that the
charge separation effect appears to be in-plane rather than
out-of-plane. It is discovered that the charge separation effect is
proportional to the event-by-event azimuthal anisotropy and
consistent with zero in events with zero azimuthal anisotropy.
These studies suggest that the charge separation effect, within the
statistical error, may be a net effect of event anisotropy and
correlated particle production. A potential upper limit on the CME
is also presented through this data.
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