Decomposition of flow and nonflow in relativistic heavy-ion collisions

Abstract

We propose a method to separate Δη-dependent and Δη-independent azimuthal correlations using two- and four-particle cumulants between pseudo-rapidity (η) bins in symmetric heavy-ion collisions. The Δη-independent correlation may be dominated by harmonic flows, a global correlation to the common collision geometry. The Δη-dependent correlation can be identified as nonflow, particle correlations unrelated to the common geometry. Our method exploits the ηsymmetry of the average harmonic flows and is "data-driven." We use the AMPT and HIJING event generators to illustrate our method. We discuss the decomposed Δη-independent and Δη-dependent correlations regarding flow and nonflow in the models.

16 pages, 15 figures, 1 table

References in corpus (8)

• Triangular flow in event-by-event ideal hydrodynamics in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200A$ GeV
• Elliptic flow in the Gaussian model of eccentricity fluctuations
• Effect of flow fluctuations and nonflow on elliptic flow methods
• Jets, Mach cone, hot spots, ridges, harmonic flow, dihadron and $\gamma$-hadron correlation in high-energy heavy-ion collisions
• Elliptic flow fluctuations in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV
• Azimuth quadrupole component spectra on transverse rapidity ${\mathbf{y}}_{\mathbf{t}}$ for identified hadrons from Au-Au collisions at $\sqrt{s_{NN}}=$ 200 GeV
• Elliptic flow fluctuations and correlations in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV
• A method for determining event-by-event elliptic flow fluctuations based on the first-order event plane in heavy-ion collisions

Cited by in corpus (4)

• Principal component analysis of event-by-event fluctuations
• Searches for transverse momentum dependent flow vector fluctuations in Pb-Pb and p-Pb collisions at the LHC
• Anisotropic flow and flow fluctuations for Au + Au at $\sqrt{s_{NN}}$ = 200 GeV in a multiphase transport model
• Complications in the interpretation of the charge asymmetry dependent $\pi$ flow for the chiral magnetic wave