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Exposing the noncollectivity in elliptic flow.

Jinfeng Liao1, Volker Koch

  • 1Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. jliao@lbl.gov

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|August 8, 2009
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Summary
This summary is machine-generated.

Backward-forward elliptic anisotropy correlation is a new observable that separates collective from noncollective effects in heavy ion collisions. Measuring this will show where collective expansion stops and hard processes dominate elliptic anisotropy.

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Area of Science:

  • Nuclear Physics
  • High-Energy Physics
  • Quantum Chromodynamics

Background:

  • Relativistic heavy ion collisions create a quark-gluon plasma.
  • Elliptic anisotropy (v_{2}) is a key observable in these collisions.
  • Distinguishing collective from noncollective contributions to v_{2} is crucial.

Purpose of the Study:

  • Introduce backward-forward elliptic anisotropy correlation as a novel observable.
  • Separate collective expansion effects from (semi)hard processes in v_{2}.
  • Determine the momentum scale where collective expansion ceases.

Main Methods:

  • Theoretical analysis of elliptic anisotropy.
  • Developing the backward-forward correlation observable.
  • Simulations of relativistic heavy ion collisions.

Main Results:

  • Backward-forward elliptic anisotropy correlation experimentally distinguishes collective and noncollective v_{2} contributions.
  • This observable provides a direct probe of the momentum scale of collective expansion.

Conclusions:

  • The proposed observable offers a new tool to study the dynamics of quark-gluon plasma.
  • It allows for the investigation of the transition from collective to noncollective behavior in heavy ion collisions.