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One of the primary aims of the ongoing nuclear collisions at RelativisticHeavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies is to createa Quark Gluon Plasma (QGP). The heavy quarks constitutes a unique probe of theQGP properties. Both at RHIC and LHC energies a puzzling relation between thenuclear modification factor $R_{AA}(p_T)$ and the elliptic flow $v_2(p_T)$related to heavy quark has been observed which challenged all the existingmodels.\\ We discuss how the temperature dependence of the heavy quark dragcoefficient can address for a large part of such a puzzle. We have consideredfour different models to evaluate the temperature dependence of drag anddiffusion coefficients propagating through a quark gluon plasma (QGP). All thefour different models are set to reproduce the same $R_{AA}(p_T)$experimentally observed at RHIC energy. We have found that for the same$R_{AA}(p_T)$ one can generate $2-3$ times more $v_{2}$ depending on thetemperature dependence of the heavy quark drag coefficient.

Toward an understanding of the $R_{AA}$ and $v_2$ puzzle for heavy quarks