Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation
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 {Rho} 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 {radical}s{sub NN} = 200 GeV using the STAR detector. A signal consistent with several expectations from the theory is detected. We discuss possible contributions from other effects that are not related to parity violation.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- National Energy Research Scientific Computing Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 986233
- Report Number(s):
- LBNL-3786E; TRN: US1006609
- Journal Information:
- Physical Review Letter, Journal Name: Physical Review Letter
- Country of Publication:
- United States
- Language:
- English
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Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation