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Dynamical collisional energy loss and transport properties of on- and off-shell heavy quarks in vacuum and in the quark gluon plasma

Abstract : In this study we evaluate the dynamical collisional energy loss of heavy quarks, their interaction rate as well as the different transport coefficients (drag and diffusion coefficients, $\hat{q}$, etc). We calculate these different quantities for i) perturbative partons (on-shell particles in the vacuum with fixed and running coupling) and ii) for dynamical quasi-particles (off-shell particles in the QGP medium at finite temperature $T$ with a running coupling in temperature as described by the dynamical quasi-particles model). We use the perturbative elastic $(q(g) Q \rightarrow q (g) Q)$ cross section for the first case, and the Infrared Enhanced Hard Thermal Loop cross sections for the second. The results obtained in this work demonstrate the effects of a finite parton mass and width on the heavy quark transport properties and provide the basic ingredients for an explicit study of the microscopic dynamics of heavy flavors in the QGP - as formed in relativistic heavy-ion collisions - within transport approaches developed previously by the authors.
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http://hal.in2p3.fr/in2p3-01006577
Contributor : Sylvie Flores <>
Submitted on : Monday, June 16, 2014 - 12:56:43 PM
Last modification on : Thursday, February 4, 2021 - 12:28:02 PM

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H. Berrehrah, Pol-Bernard Gossiaux, Jörg Aichelin, W. Cassing, E. Bratkovskaya. Dynamical collisional energy loss and transport properties of on- and off-shell heavy quarks in vacuum and in the quark gluon plasma. Physical Review C, American Physical Society, 2014, 90 (6), pp.064906. ⟨10.1103/PhysRevC.90.064906⟩. ⟨in2p3-01006577⟩

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