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Parity paper proposal

Updated on Tue, 2010-07-13 10:10. Originally created by seluzhen on 2008-10-24 11:35. Under:

Azimuthal Charged-Particle Correlations
and Possible Local Strong Parity Violation

Published in Phys. Rev. Lett. 103, 251601 (2009)

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 √sNN=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.

Observation of charge-dependent azimuthal correlations
and possible local strong parity violation in heavy-ion collision

Published in Phys. Rev. C 81, 054908 (2010)

Abstract
Parity (P)-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 orbital momentum of the system created in noncentral collisions.
To study this effect, we investigate a three-particle mixed-harmonics azimuthal correlator
which is a P-even observable, but directly sensitive to the charge-separation effect.
We report measurements of this observable using the STAR detector in Au+Au and Cu+Cu collisions at √sNN=200 and 62 GeV.
The results are presented as a function of collision centrality,
particle separation in rapidity, and particle transverse momentum.
A signal consistent with several of the theoretical expectations is detected in all four data sets.
We compare our results to the predictions of existing event generators and
discuss in detail possible contributions from other effects that are not related to P violation.

Data & figures

Principal authors

  • Wayne State: Sergei Voloshin
  • Indiana: Ilya Selyuzhenkov
  • BNL: Vasily Dzordzhadze, Ron Longacre, Yannis Semertzidis, Paul Sorensen
  • UCLA: Gang Wang, Dhevan Gangadharan
  • Yale: Jack Sandweiss, Evan Finch, Alexey Chikanian, Richard Majka
  • LBNL: Jim Thomas
  • MEPhI: Vitaly Okorokov

GPC members

  • Carl Gagliardi, Chair
  • Ernst Sichtermann, Member
  • Peter Seyboth, Member
  • Mike Lisa, PWG representative
  • Spencer Klein, English/Grammar QA
  • Jin-Hui Chen, Analysis Code QA
  • Sergei Voloshin, PA Representative
  • Jack Sandweiss, PA Representative

Collaboration Comments

GPC Comments

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