Heavy Flavor Suppression: Boltzmann vs Langevin

Abstract

The propagation of heavy flavor through the quark gluon plasma has been treated commonly within the framework of Langevin dynamics, i.e. assuming the heavy flavor momentum transfer is much smaller than the light one. On the other hand a similar suppression factor $R_{AA}$ has been observed experimentally for light and heavy flavors. We present a thorough study of the approximations involved by Langevin equation by mean of a direct comparison with the full collisional integral within the framework of Boltzmann transport equation. We have compared the results obtained in both approaches which can differ substantially for charm quark leading to quite different values extracted for the heavy quark diffusion coefficient. In the case of bottom quark the approximation appears to be quite reasonable.

4 pages, 3 figures, Talk given at SQM-2013 (Birmingham, UK)

References in corpus (8)

• Nonperturbative Heavy-Quark Diffusion in the Quark-Gluon Plasma
• Towards an understanding of the RHIC single electron data
• Heavy-flavour spectra in high energy nucleus-nucleus collisions
• Heavy Quark Diffusion with Relativistic Langevin Dynamics in the Quark-Gluon Fluid
• Heavy flavours in AA collisions: production, transport and final spectra
• Scalings of Elliptic Flow for a Fluid at Finite Shear Viscosity
• Charm quark transport in Pb+Pb reactions at sqrt{s}_NN=2.76 TeV from a (3+1) dimensional hybrid approach
• Charm Quark Energy Loss In Infinite QCD Matter Using A Parton Cascade Model

Cited by in corpus (3)

• Toward a solution to the $R_{AA}$ and $v_2$ puzzle for heavy quarks
• Toward a consistent evolution of the quark-gluon plasma and heavy quarks
• Elliptic flow and $R_{AA}$ of D mesons at FAIR comparing the UrQMD hybrid model and the coarse-graining approach