Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation
Author(s)Redwine, Robert P.; Jones, Christopher LaDon; Leight, William Axel; Seele, Joseph Patrick; van Nieuwenhuizen, Gerrit Jan; Walker, Matthew H.; Sakuma, Tai; Corliss, Ross Cameron; Milner, Richard G.; Kocoloski, Adam Philip; Hoffman, A. M.; Balewski, Jan T.; Betancourt, Michael Joseph; Surrow, Bernd; ... Show more Show less
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Parity-odd domains, corresponding to nontrivial 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 [sqrt s[subscript 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.
DepartmentBates Linear Accelerator Center; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review Letters
American Physical Society
Abelev, B.I. et al. "Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation.” Phys. Rev. Lett. 103, 251601 (2009) © 2009 The American Physical Society.
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