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Quarkonia and heavy-quark relaxation times in the quark-gluon plasma

Riek, F. ; Rapp, R.

Physical review. C, Nuclear physics, 2010-09, Vol.82 (3)

United States

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Título:
Quarkonia and heavy-quark relaxation times in the quark-gluon plasma
Autor: Riek, F. ; Rapp, R.
Assuntos: B QUARKS ; BEAUTY PARTICLES ; BETHE-SALPETER EQUATION ; BOUND STATE ; C QUARKS ; CHARM PARTICLES ; CONSTRUCTIVE FIELD THEORY ; CORRECTIONS ; COUPLING ; DIFFERENTIAL EQUATIONS ; DIFFUSION ; ELASTIC SCATTERING ; ELEMENTARY PARTICLES ; ENERGY ; ENERGY RANGE ; EQUATIONS ; FERMIONS ; FIELD THEORIES ; FOKKER-PLANCK EQUATION ; FREE ENERGY ; FUNCTIONS ; LATTICE FIELD THEORY ; MATRICES ; MATTER ; MOMENTUM TRANSFER ; NUCLEAR PHYSICS AND RADIATION PHYSICS ; PARTIAL DIFFERENTIAL EQUATIONS ; PHYSICAL PROPERTIES ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; POSTULATED PARTICLES ; QUANTUM CHROMODYNAMICS ; QUANTUM FIELD THEORY ; QUARK MATTER ; QUARKONIUM ; QUARKS ; RELATIVISTIC RANGE ; S MATRIX ; SCATTERING ; SPECTRAL FUNCTIONS ; SPECTROSCOPY ; T QUARKS ; THERMODYNAMIC PROPERTIES ; TOP PARTICLES
É parte de: Physical review. C, Nuclear physics, 2010-09, Vol.82 (3)
Descrição: A thermodynamic T-matrix approach for elastic two-body interactions is employed to calculate spectral functions of open and hidden heavy-quark systems in the quark-gluon plasma. This enables the evaluation of quarkonium bound-state properties and heavy-quark diffusion on a common basis and thus to obtain mutual constraints. The two-body interaction kernel is approximated within a potential picture for spacelike momentum transfers. An effective field-theoretical model combining color-Coulomb and confining terms is implemented with relativistic corrections and for different color channels. Four pertinent model parameters, characterizing the coupling strengths and screening, are adjusted to reproduce the color-average heavy-quark free energy as computed in thermal lattice QCD. The approach is tested against vacuum spectroscopy in the open (D, B) and hidden ({Psi} and {Upsilon}) flavor sectors, as well as in the high-energy limit of elastic perturbative QCD scattering. Theoretical uncertainties in the static reduction scheme of the four-dimensional Bethe-Salpeter equation are elucidated. The quarkonium spectral functions are used to calculate Euclidean correlators which are discussed in light of lattice QCD results, while heavy-quark relaxation rates and diffusion coefficients are extracted utilizing a Fokker-Planck equation.
Editor: United States
Idioma: Inglês

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Quarkonia and heavy-quark relaxation times in the quark-gluon plasma

Riek, F. ; Rapp, R.

United States

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