The Study of Noncollectivity by the Forward-Backward Multiplicity Correlation Function

Details The Study of Noncollectivity by the Forward-Backward Multiplicity Correlation Function The Study of Noncollectivity by the Forward-Backward Multiplicity Correlation Function

2011-12-19

arxiv.org/abs/1112.4242v1

Physics

Nuclear Physics

Nuclear Theory

5 pages, 4 figures

Scientific paper

We propose a forward-backward multiplicity correlation function $C^N_{FB}$, which is experimentally accessible, to measure the noncollectivity contribution. We find that $C^N_{FB}$ is sensitive to the jet contribution for the particle-rich case. Surprisingly, it will automatically decrease for the particle-rare case. Our study indicates that similar decreasing trend observed previously is mainly driven by particle scarcity instead of jets. The function is studied in Au+Au collision at $\sqrt{s_{NN}}=200$ GeV with a multiphase transport model (AMPT). We find that the jet fraction is about 10% at transverse momentum ($p_T$) around 2.5 GeV/$c$ and reaches up to 30% at 3.5 GeV/$c$. The implication of this study in the investigation of the noncollectivity contribution in elliptic anisotropy parameter $v_2$ is also discussed.

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