Journal
NUCLEAR PHYSICS A
Volume 896, Issue -, Pages 24-45Publisher
ELSEVIER
DOI: 10.1016/j.nuclphysa.2012.09.008
Keywords
T-matrix; Heavy-quark diffusion; Quark-gluon plasma
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Funding
- U.S. National Science Foundation (NSF) grant [PHY-0969394]
- A.-v.-Humboldt Foundation
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The interactions of charm and bottom quarks in a quark-gluon plasma (QGP) are evaluated using a thermodynamic 2-body T-matrix. We specifically focus on heavy-quark (HQ) interactions with thermal gluons with an input potential motivated by lattice-QCD computations of the HQ free energy. The latter is implemented into a field-theoretic ansatz for color-Coulomb and (remnants of) confining interactions. This, in particular, enables to discuss corrections to the potential approach, specifically hard-thermal-loop corrections to the vertices, relativistic corrections deduced from pertinent Feynman diagrams, and a suitable projection on transverse thermal gluons. The resulting potentials are applied to compute scattering amplitudes in different color channels and utilized for a calculation of the corresponding HQ drag coefficient in the QGP. A factor of similar to 2-3 enhancement over perturbative results is obtained, mainly driven by the resummation in the attractive color-channels. (c) 2012 Elsevier B.V. All rights reserved.
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