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Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation

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Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation

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Author: Abelev, B. I.; Aggarwal, M. M.; Ahammed, Z.; Alakhverdyants, A. V.; Anderson, B. D.; Arkhipkin, D.; Averichev, G. S.; Balewski, J.; Barannikova, O.; Barnby, L. S.; Baumgart, S.; Beavis, D. R.; Bellwied, R.; Benedosso, F.; Betancourt, M. J.; Betts, R. R.; Bhasin, A.; Bhati, A. K.; Bichsel, H.; Bielcik, J.; Bielcikova, J.; Biritz, B.; Bland, L. C.; Bnzarov, I.; Bonner, B. E.; Bouchet, J.; Braidot, E.; Brandin, A. V.; Bridgeman, A.; Bruna, E. ... [more in full view]
Department: Bates Linear Accelerator Center; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. Dept. of Physics
Publisher: American Physical Society
Date Issued: 2009-12
Abstract:
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.
URI: http://hdl.handle.net/1721.1/53701
ISSN: 0031-9007
Citation: 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.
Version: Final published version
Terms of Use: Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Published As: http://dx.doi.org/10.1103/PhysRevLett.103.251601
Journal: Physical Review Letters

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