4.8 Article

Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation

期刊

PHYSICAL REVIEW LETTERS
卷 103, 期 25, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.251601

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资金

  1. Offices of NP and HEP within the U.S. DOE Office of Science
  2. U.S. NSF
  3. Sloan Foundation
  4. DFG cluster of excellence
  5. CNRS/IN2P3
  6. STFC and EPSRC of the United Kingdom
  7. FAPESP CNPq of Brazil
  8. Ministry of Ed. and Sci. of the Russian Federation
  9. NNSFC
  10. CAS
  11. MoST
  12. MoE of China
  13. GA and MSMT of the Czech Republic
  14. FOM and NOW of the Netherlands
  15. DAE
  16. DST
  17. CSIR of India
  18. Polish Ministry of Sci. and Higher Ed.
  19. Korea Research Foundation
  20. Ministry of Sci., Ed. and Sports of the Rep. Of Croatia
  21. Russian Ministry of Sci. and Tech
  22. RosAtom of Russia
  23. STFC [PP/F001061/1] Funding Source: UKRI
  24. Science and Technology Facilities Council [PP/F001061/1] Funding Source: researchfish
  25. Direct For Mathematical & Physical Scien
  26. Division Of Physics [0758018] Funding Source: National Science Foundation

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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 s(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.

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