Measurements of Dihadron Correlations Relative to the Event Plane in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV

Details Measurements of Dihadron Correlations Relative to the Event Plane in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV Measurements of Dihadron Correlations Relative to the Event Plane in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV

2010-10-04

arxiv.org/abs/1010.0690v1

Physics

Nuclear Physics

Nuclear Experiment

41 pages, 31 figures, 4 tables

Scientific paper

Dihadron azimuthal correlations containing a high transverse momentum (pt) trigger particle are sensitive to the properties of the nuclear medium created at RHIC through the strong interactions occurring between the traversing parton and the medium, i.e. jet-quenching. Previous measurements revealed a strong modification to dihadron azimuthal correlations in Au+Au collisions with respect to p+p and d+Au collisions. The modification increases with the collision centrality, suggesting a path-length dependence to the jet-quenching effect. This paper reports STAR measurements of dihadron azimuthal correlations in medium central (20-60%) Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV as a function of the trigger particle's azimuthal angle relative to the event plane, $\phi_s=|\phi_t-\psi_{EP}|$. The azimuthal correlation is studied as a function of both trigger and associated particle pt. The subtractions of the combinatorial background and anisotropic flow, assuming Zero Yield At Minimum (ZYAM), are described. The away-side correlation is strongly modified, and the modification varies with $\phi_s$, which is expected to be related to the path-length that the away-side parton traverses. The pseudo-rapidity ($\Delta\eta$) dependence of the near-side correlation, sensitive to long range $\Delta\eta$ correlations (the ridge), is also investigated. The ridge and jet-like components of the near-side correlation are studied as a function of $\phi_s$. The ridge appears to drop with increasing $\phi_s$ while the jet-like component remains approximately constant. These results, with extensive systematic studies of the dihadron correlations as a function of $\phi_s$, trigger and associated particle pt, and the pseudo-rapidity range $\Delta\eta$, should provide stringent inputs to help understand the underlying physics mechanisms of jet-medium interactions in high energy nuclear collisions.

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