Physical Review C
STAR measurements of dihadron azimuthal correlations (ΔΦ) are reported in midcentral (20-60%) Au + Au collisions at √ˢᴺᴺ = 200 GeV as a function of the trigger particle's azimuthal angle relative to the event plane, Φs = | Φt- ΨEP|. The elliptic (v2), triangular (v3), and quadratic (v4) flow harmonic backgrounds are subtracted using the zero yield at minimum (ZYAM) method. It is found that a finite near-side (|ΔΦ| < π/2) long-range pseudorapidity correlation (ridge) is present in the in-plane direction (Φs ~ 0). The away-side (|ΔΦ| > π/2) correlation shows a modification from d+ Au data, varying with Φs. The modification may be a consequence of path-length-dependent jet quenching and may lead to a better understanding of high-density QCD.
Original Publication Citation
Agakishiev, H., Aggarwal, M. M., Ahammed, Z., Alakhverdyants, A. V., Alekseev, I., Alford, J., . . . Zoulkarneeva, Y. (2014). Event plane dependent dihadron correlations with harmonic vn subtraction in Au + Au collisions at √ˢᴺᴺ = 200 GeV. Physical Review C, 89(4), 041901. doi:10.1103/PhysRevC.89.041901
Agakishiev, H.; Aggarwal, M. M.; Ahammed, Z.; Bueltmann, S.; Plyku, D.; and STAR Collaboration, "Event Plane Dependent Dihadron Correlations with Harmonic Vⁿ Subtraction in Au + Au Collisions at √ˢᴺᴺ = 200 GeV" (2014). Physics Faculty Publications. 175.