Quark recombination and elliptic flow

Abstract

Elliptic flow systematics for different hadron species have been explained by quark coalescence models. It has been argued that the elliptic asymmetry v_2 should scale with the number of quarks that comprise the hadron. We show how these arguments are sensitive to the relative role of asymmetries in the phase space density vs. asymmetries in the effective volume of emission. We also discuss the degree to which coalescence arguments differ from thermal models. Illustrative calculations based on solving the Boltzmann equation are presented along with the results of blast-wave models. Although the issue is complicated, ambiguities might be clarified by measurements of source-size parameters for nucleons at higher transverse momenta.

16 pages, 5 figures

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• Hadronic signals of deconfinement at RHIC
• Analytical coalescence formula for particle production in relativistic heavy-ion collisions
• Thermal Recombination: Beyond the Valence Quark Approximation
• Azimuthal Anisotropy: Ridges, Recombination and Breaking of Quark Number Scaling
• Lambda over Kaon Enhancement in Heavy Ion Collisions at Several TeV
• Elliptic Flow: A Study of Space-Momentum Correlations In Relativistic Nuclear Collisions
• Interplay among the azimuthally dependent HBT radii and the elliptic flow
• Scaling of elliptic flow in heavy-ion collisions with the number of constituent quarks in a transport model
• Quark number scaling of $v_2$ in transverse kinetic energy and it's implications for coalescence models
• Phase-Space Coalescence for heavy and light quarks at RHIC
• Investigating the scaling of higher-order flows in relativistic heavy-ion collisions
• Decreasing elliptic flow at the LHC: Calculations in a parton recombination approach
• Elliptic Flow and Fixed p_T Suppression in a Final State Interaction Model
• Centrality dependence of $p_T$ spectra for identified hadrons in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}=200$ GeV
• Highlights from Heavy Ion Collisions at RHIC and the Acoustics of the Little Bangs