Speaker
Alexei Chikanian
Description
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 system's orbital momentum axis. We investigate a three
particle azimuthal correlator which is a P even observable, but directly
sensitive to the charge separation effect. We report measurements of
charged hadrons near center-of-mass rapidity with this observable in
Au+Au and Cu+Cu collisions at psNN=200 GeV/c using the STAR detector.
The results are presented as a function of collision centrality,
particle separation in rapidity, and particle transverse momentum.
Consistency cross checks for different data sets, detectors and
kinematic regions are performed. A signal consistent with several
expectations from the theory is detected. We compare our results to the
predictions of existing event generators, and discuss possible
contributions from other effects that are not related to parity violation.
New ideas, future experimental and analysis plans are discussed.
Primary author
Alexei Chikanian
