Heavy-Quark Probes of the Quark-Gluon Plasma at RHIC

Details Heavy-Quark Probes of the Quark-Gluon Plasma at RHIC Heavy-Quark Probes of the Quark-Gluon Plasma at RHIC

2005-08-27

arxiv.org/abs/nucl-th/0508055v3

Phys.Rev.C73:034913,2006

Physics

Nuclear Physics

Nuclear Theory

4 pages, 3 figures, v2: 1 reference updated, v3: replaced comparison to data to more recent data, references added, contents u

Scientific paper

10.1103/PhysRevC.73.034913

Thermalization and collective flow of charm (c) and bottom (b) quarks in ultra-relativistic heavy-ion collisions are evaluated based on elastic parton rescattering in an expanding quark-gluon plasma (QGP). We show that resonant interactions in a strongly interacting QGP (sQGP), as well as the effects of parton coalescence, can play an essential role in the interpretation of recent data from the Relativistic Heavy-Ion Collider (RHIC), and thus illuminate the nature of the sQGP and its hadronization. Our main assumption, motivated by recent findings in lattice computations of Quantum Chromodynamics, is the existence of D- and B-meson states in the sQGP, providing resonant cross sections for heavy quarks up to temperatures of sim 2 T_c. Pertinent drag and diffusion coefficients are implemented into a relativistic Langevin simulation to compute transverse-momentum spectra and azimuthal asymmetries (v_2) of b- and c-quarks in Au-Au collisions at RHIC. Hadronization into D- and B-mesons is calculated from a combination of coalescence with light quarks and fragmentation, and associated electron-decay spectra and v_2 are compared to recent RHIC data. We also comment on the relative importance of radiative and elastic energy loss of heavy quarks in the QGP.

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