Three-particle coincidence of the long range pseudorapidity correlation in high energy nucleus-nucleus collisions

Details Three-particle coincidence of the long range pseudorapidity correlation in high energy nucleus-nucleus collisions Three-particle coincidence of the long range pseudorapidity correlation in high energy nucleus-nucleus collisions

2009-12-20

arxiv.org/abs/0912.3977v2

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 4 figures

Scientific paper

We report the first three-particle coincidence measurement in pseudorapidity ($\Delta\eta$) between a high transverse momentum ($p_{\perp}$) trigger particle and two lower $p_{\perp}$ associated particles within azimuth $\mid$$\Delta\phi$$\mid$$<$0.7 in $\sqrt{{\it s}_{NN}}$ = 200 GeV $d$+Au and Au+Au collisions. Charge ordering properties are exploited to separate the jet-like component and the ridge (long-range $\Delta\eta$ correlation). The results indicate that the particles from the ridge are uncorrelated in $\Delta\eta$ not only with the trigger particle but also between themselves event-by-event. In addition, the production of the ridge appears to be uncorrelated to the presence of the narrow jet-like component.

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