Toward a solution to the $R_{AA}$ and $v_2$ puzzle for heavy quarks

Santosh K. Das; Francesco Scardina; Salvatore Plumari; Vincenzo Greco

doi:10.1016/j.physletb.2015.06.003

paper

Toward a solution to the $R_{AA}$ and $v_{2}$ puzzle for heavy quarks

arXiv:1502.03757 · doi:10.1016/j.physletb.2015.06.003

Abstract

The heavy quarks constitutes a unique probe of the quark-gluon plasma properties. Both at RHIC and LHC energies a puzzling relation between the nuclear modification factor $R_{AA} (p_{T})$ and the elliptic flow $v_{2} (p_{T})$ has been observed which challenged all the existing models, especially for D mesons. We discuss how the temperature dependence of the heavy quark drag coefficient is responsible for a large part of such a puzzle. In particular, we have considered four different models to evaluate the temperature dependence of drag and diffusion coefficients propagating through a quark gluon plasma (QGP). All the four different models are set to reproduce the same $R_{AA} (p_{T})$ observed in experiments at RHIC and LHC energy. We point out that for the same $R_{AA} (p_{T})$ one can generate 2-3 times more $v_{2}$ depending on the temperature dependence of the heavy quark drag coefficient. A non-decreasing drag coefficient as $T \to T_{c}$ is a major ingredient for a simultaneous description of $R_{AA} (p_{T})$ and $v_{2} (p_{T})$ .

7 pages, 6 figures, Accepted for publication in Physics Letters B

Toward a solution to the $R_{AA}$ and $v_{2}$ puzzle for heavy quarks

Abstract

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Toward a solution to the RAA​ and v2​ puzzle for heavy quarks

Abstract

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Toward a solution to the $R_{AA}$ and $v_{2}$ puzzle for heavy quarks