Quark Coalescence based on a Transport Equation

2007/04/30 by L. Ravagli, R. Rapp · 1 citation
Physics and Astronomy · #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1016/j.physletb.2007.07.043

published as Phys.Lett.B655:126-131,2007 · 7 pages, 6 figures

arxiv created 2007/04/30 · arxiv updated 2009/12/01

Abstract

We employ the Boltzmann equation for describing hadron production from a quark-gluon plasma (QGP) in ultrarelativistic heavy-ion collisions. We propose resonance formation in quark-antiquark scattering as the dominant meson-production channel, which, in particular, ensures that energy is conserved in the recombination process. This, in turn, facilitates a more controlled extension of hadronization to low transverse momenta (p_T), and to address the experimentally observed transition from a hydrodynamic regime to constituent quark-number scaling (CQNS). Based on input distributions for strange and charm quarks with azimuthal asymmetries, v₂(p_T), characteristic for RHIC energies, we recover CQNS at sufficiently high p_T, while at low p_T a scaling with transverse kinetic energy is found, reminiscent to experiment. The dependence of the transition regime on microscopic QGP properties, i.e. resonance widths and Q-values in the q+ q → M process, is elucidated.

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