Event-plane-dependent dihadron correlations with harmonic v[subscript n] subtraction in Au + Au collisions at √s[subscript NN] = 200 GeV

• Main Authors: Balewski, Jan T. (Contributor), Betancourt, Michael Joseph (Contributor), Corliss, Ross (Contributor), Hays-Wehle, James Prewitt (Contributor), Leight, William Axel (Contributor), Milner, Richard G. (Contributor), Redwine, Robert P. (Contributor), Sakuma, T. (Contributor), Seele, J. (Contributor), Steadman, Stephen G. (Contributor), Surrow, Bernd (Contributor), van Nieuwenhuizen, Gerrit Jan (Contributor), Walker, M. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2014-08-21T18:09:56Z.
• Subjects: Article
• Online Access: Get fulltext

 STAR measurements of dihadron azimuthal correlations (Δϕ) are reported in midcentral (20-60%) Au + Au collisions at √s[subscript NN] = 200 GeV as a function of the trigger particle's azimuthal angle relative to the event plane, ϕ[subscript s] = |ϕ[subscript t] − ψ[subscript EP]|. The elliptic (v[subscript 2]), triangular (v[subscript 3]), and quadratic (v[subscript 4]) 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 (|Δϕ| < π/2) long-range pseudorapidity correlation (ridge) is present in the in-plane direction (ϕ[subscript s] ∼ 0). The away-side (|Δϕ| > π/2) correlation shows a modification from d + Au data, varying with ϕ[subscript s]. The modification may be a consequence of path-length-dependent jet quenching and may lead to a better understanding of high-density QCD.