ICPAQGP-2010

5-10 December 2010

6th International Conference on Physics and Astrophysics of Quark Gluon Plasma (ICPAQGP 2010)

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Three-particle correlations at RHIC

Content:

Correlations among the produced particles provide a powerful tool to study the properties of the medium created in ultrarelativistic heavy-ion collisions. The near-side "ridge" and the away-side "cone" structures observed in the central Au+Au collision data has inspired various theoretical models to explain the particle production mechanism. Qualitatively most of the models give similar results when compared with the di-hadron correlations. Three-particle correlation analysis will allow us to distinguish among these models having different physics mechanisms for particle production. In this talk, we will present the 3-particle correlation data for $d$+Au and Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV from Relativistic Heavy Ion Collider (RHIC). The away-side conical emission of the associated particles in azimuth ($\phi$) with respect to a high transverse momentum ($p_{\perp}$) trigger particle in the data are found to be consistent with the "mach cone" scenario[1]. The cone angle is independent of $p_{\perp}$ of the associated particles. On the other hand, it is observed that the 3-particle pseudorapidity ($\eta$) correlations of the near-side ridge particles are uniform not only with respect to 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 [2]. The wealth of the 3-particle correlation data will provide further constraints on the theoretical model calculations for the production mechanism of the cone and the ridge. References: [1] B.~I.~Abelev {\it et al.}, (STAR collaboration) Phys. Rev. Lett. {\bf 102}, 052302 (2009). [2] B.~I.~Abelev {\it et al.}, (STAR collaboration) Phys. Rev. Lett. {\bf 105}, 022301 (2010).

Id:

Place:

Room: Main Auditorium

Starting date:

--not yet scheduled--

Duration:

00'

Primary Authors:

Dr. NETRAKANTI, Pawan Kumar (Bhabha Atomic Research Center)
Dr. WANG, Fuqiang (Purdue University)
Dr. ULERY, Jason (U. Frankfurt)

Presenters:

Dr. NETRAKANTI, Pawan Kumar