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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Schwerionenkollisionen und QCD Phasen
HK 26.3: Vortrag
Dienstag, 18. März 2014, 17:15–17:30, HZ 6
On- and off-shell heavy quark transport properties in the quark gluon plasma (QGP) — •Hamza Berrehrah1, Elena Bratkovskaya1, Wolfgang Cassing2, Pol-Bernard Gossiaux3, and Jörg Aichelin3 — 1FIAS, Frankfurt, Germany — 2ITP, Giessen, Germany — 3Subatech, Nantes, France
Within the aim of a dynamical study of on- and off-shell heavy quarks Q in the quark gluon plasma (QGP) [1] - as produced in relativistic nucleus-nucleus collisions - we study the heavy quark collisional scattering on partons of the QGP and the underlying transport properties. The elastic cross sections are evaluated for perturbative partons (massless on-shell particles) and for dynamical quasi-particles (massive off-shell particles as described by the dynamical quasi-particles model DQPM) using the leading order Born diagrams [2]. Correspondingly, the on- and off-shell heavy quark dynamical collisional energy loss and transport coefficients are computed [3]. Within our study, we demonstrate the influence of the finite width of the quasi-particles on heavy quarks scattering. We, furthermore, provide a comprehensive comparison between perturbative and non-perturbative QCD based models on the determination of the heavy quark transport coefficients (drag and diffusion, longitudinal and transverse Q momentum fluctuations, etc.).
[1] W. Cassing, and E. L. Bratkovskaya, Nucl.Phys. A831 (2009) 215-242. [2] H. Berrehrah, E. Bratkovskaya, W. Cassing, P.B. Gossiaux, J. Aichelin, and M. Bleicher, arXiv:1308.5148. [3] H. Berrehrah, E. Bratkovskaya, W. Cassing, P.B. Gossiaux and J. Aichelin, to be submitted.