T-matrix approach to heavy quark diffusion in the QGP |
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Authors: | H van Hees M Mannarelli V Greco and R Rapp |
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Institution: | 1.Institut für Theoretische Physik,Justus-Liebig-Universit?t Giessen,Giessen,Germany;2.Instituto de Ciencias del Espacio (IEEC/CSIC),Bellaterra (Barcelona),Spain;3.INFN-LNS,Catania,Italy;4.Dipartimento Interateneo di Fisica di Bari,Bari,Italy;5.Cyclotron Institute and Physics Department,Texas A&M University,College Station,USA |
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Abstract: | We assess transport properties of heavy quarks in the quark–gluon plasma (QGP) using static heavy-quark (HQ) potentials from
lattice-QCD calculations in a Brueckner many-body T-matrix approach to evaluate elastic heavy-quark–light-quark scattering amplitudes. In the attractive meson and diquark channels,
resonance states are formed for temperatures up to ∼1.5T
c, increasing pertinent drag and diffusion coefficients for heavy-quark rescattering in the QGP beyond the expectations from
perturbative-QCD calculations. We use these transport coefficients, complemented with perturbative elastic HQ gluon scattering,
in a relativistic Langevin simulation to obtain HQ p
t distributions and elliptic flow (v
2) under conditions relevant for the hot and dense medium created in ultrarelativistic heavy-ion collisions. The heavy quarks
are hadronized to open-charm and -bottom mesons within a combined quark-coalescence fragmentation scheme. The resulting single-electron
spectra from their semileptonic decays are confronted with recent data on “non-photonic electrons” in 200 A GeV Au–Au collisions at the Relativistic Heavy-Ion Collider (RHIC). |
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