Event-plane-dependent dihadron correlations with harmonic $v_n$ subtraction in Au + Au collisions at $\sqrt{s_{NN}}=200$ GeV - INSPIRE

Event-plane-dependent dihadron correlations with harmonic $v_n$ subtraction in Au + Au collisions at $\sqrt{s_{NN}}=200$ GeV

STAR

Collaboration

•

H. Agakishiev
(
- Dubna, JINR
)

Apr 3, 2014

7 pages

Published in:

Phys.Rev.C 89 (2014) 4, 041901

Published: Apr 18, 2014

e-Print:

1404.1070 [nucl-ex]

DOI:

10.1103/PhysRevC.89.041901

Experiments:

BNL-RHIC-STAR

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Abstract: (APS)

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. 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 (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.

Note:

8 pages, 3 figures. Accepted by Phys.Rev.C Rapid Communications

25.75.Dw
rapidity: correlation: long-range
dihadron: angular correlation
quantum chromodynamics
elliptic flow
background
flow
STAR
heavy ion: scattering
gold

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