Isolation of Flow and Nonflow by Two- and Multi-Particle Cumulant Measurements of $v_n$ in $\sqrt{s_{NN}}=200$ GeV Au+Au Collisions by STAR

Abstract

We apply a data-driven method to STAR Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV to isolate $\Delta \eta$-dependent and $\Delta \eta$-independent correlations by using two- and four-particle Q-cumulant $v_n$ measurements. The $\Delta \eta$-independent part, dominated by flow, is found to be $\eta$-independent within the STAR TPC of $\pm 1$ unit of pseudo-rapidity. The $\Delta \eta$-dependent part may be associated to nonflow, and is responsible for the $\Delta \eta$ drop in the measured two-particle $v_2$ cumulant. We combine our result to four- and six-particle cumulants to gain further insights on the nature of flow fluctuations.

4 pages, 4 figures, submitted to Quark Matter 2012 proceedings

References in corpus (4)

• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• 200 A GeV Au+Au collisions serve a nearly perfect quark-gluon liquid
• Elliptic flow in the Gaussian model of eccentricity fluctuations
• Decomposition of flow and nonflow in relativistic heavy-ion collisions

Cited by in corpus (3)

• Isolation of Flow and Nonflow Correlations by Two- and Four-Particle Cumulant Measurements of Azimuthal Harmonics in $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 200 GeV Au+Au Collisions
• Azimuthal Anisotropy Measurements by STAR
• Internal cumulants for femtoscopy with fixed charged multiplicity