engleski

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

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.

deuteron gold transverse momentum; trigger heavy ion; scattering correlation; long-range rapidity; correlation correlation; (3particle) impact parameter; dependence STAR Brookhaven RHIC Coll 200 GeV-cms/nucleon

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