Azimuth Quadrupole Systematics in Au-Au Collisions

Abstract

We have measured $p_t$-dependent two-particle number correlations on azimuth and pseudorapidity for eleven centralities of $\sqrt{s_{NN}}=62$ and 200~GeV Au-Au collisions at STAR. 2D fits to these angular correlations isolate the azimuth quadrupole amplitude, denoted $2v_2^2\{2D\}(p_t)$, from localized same-side correlations. Event-plane $v_2(p_t)$ measurements within the STAR TPC acceptance can be expressed as a sum of the azimuth quadrupole and the quadrupole component of the same-side peak. $v_2\{2D\}(p_t)$ can be transformed to reveal quadrupole $p_t$ spectra which are approximately described by a fixed transverse boost and universal Lévy form nearly independent of centrality. A parametrization of $v_2\{2D\}(p_t)$ can be factored into centrality and $p_t$-dependent pieces with a simple $p_t$ dependence above 0.75 GeV/c. Results from STAR are compared to published data and model predictions.

Conference proceedings for Hot Quarks 2010

References in corpus (12)

• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Methods for analyzing anisotropic flow in relativistic nuclear collisions
• Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
• Flow at the SPS and RHIC as a Quark Gluon Plasma Signature
• Azimuthal anisotropy in Au+Au collisions at sqrtsNN = 200 GeV
• Flow analysis from multiparticle azimuthal correlations
• Minijet deformation and charge-independent angular correlations on momentum subspace $(\eta ,\varphi )$ in Au-Au collisions at $\sqrt{s_{NN}}$ = 130 GeV
• Anomalous centrality variation of minijet angular correlations in Au-Au collisions at 62 and 200 GeV from STAR
• Evolution of minimum-bias parton fragmentation in nuclear collisions
• Autocorrelations from fluctuation scale dependence by inversion
• Azimuth quadrupole component spectra on transverse rapidity ${\mathbf{y}}_{\mathbf{t}}$ for identified hadrons from Au-Au collisions at $\sqrt{s_{NN}}=$ 200 GeV
• The azimuth structure of nuclear collisions -- I

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• A critical review of RHIC experimental results
• Comparing the same-side "ridge" in CMS p-p angular correlations to RHIC p-p data
• Dijet production, collision centrality and backgrounds in high-energy p-p collisions
• On the presence of nonjet "higher harmonic" components in 2D angular correlations from high energy heavy ion collisions
• Phenomenological analysis of angular correlations in 7 TeV proton-proton collisions from the CMS experiment
• Gluon correlations from a Glasma flux-tube model compared to measured hadron correlations on transverse momentum $({\mathbf{p}}_{\mathbf{t}},{\mathbf{p}}_{\mathbf{t}})$ and angular differences $({\eta }_{\mathbf{\Delta }},{\varphi }_{\mathbf{\Delta }})$
• Optimal modeling of 1D azimuth correlations in the context of Bayesian inference
• Challenging the utility of third-order azimuth harmonics in the description of ultra-relativistic heavy-ion collisions
• The "soft ridge" - is it initial-state geometry or modified jets?
• $\mathbf{p}$-$\mathbf{p}$ minimum-bias dijets and nonjet quadrupole in relation to conjectured collectivity (flows) in high-energy nuclear collisions