Abstract
STAR measurements of dihadron azimuthal correlations () are reported in midcentral (20–60%) Au + Au collisions at GeV as a function of the trigger particle's azimuthal angle relative to the event plane, . The elliptic (), triangular (), and quadratic () flow harmonic backgrounds are subtracted using the zero yield at minimum (ZYAM) method. The results are compared to minimum-bias d + Au collisions. It is found that a finite near-side () long-range pseudorapidity correlation (ridge) is present in the in-plane direction (). The away-side () correlation shows a modification from d + Au data, varying with . The modification may be a consequence of path-length-dependent jet quenching and may lead to a better understanding of high-density QCD.
- Received 31 December 2013
DOI:https://doi.org/10.1103/PhysRevC.89.041901
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