Towards the high pT v2 and open heavy flavor in AA using a pQCD+hydro approach

We present numerical results of the high $p_T$ pion, open heavy flavor, and non-photonic electron $R_{AA}$ and $v_2$ at RHIC and LHC from the new CUJET2.0 model, where the running coupling DGLV opacity series is coupled with 2+1D viscous hydrodynamical fluids. CUJET2.0 solved the ``heavy quark energy loss puzzle" -- the $R_{AA}^{\pi,D,e^-}(p_T)$ computed from this model is highly consistent with existing data -- and it predicts a robust crossing between $R_{AA}^{\pi,D}(p_T)$ and $R_{AA}^{B}(p_T)$. We find that within CUJET2.0, the 50\% underestimate of $v_2^{\pi}(p_T)$ at both RHIC and LHC can be accounted for by relaxing the assumption that $\alpha_{max}$, an assumed upper bound of the running coupling in the infrared, is independent of the local temperature field and allowing as small as 10\% enhancement of the path averaged $\alpha_{max}$ from in-plane to out-of-plane paths. We speculate the origin of such variations and provide predictions of $v_2^{D,B,e^-}(p_T>5)$ from CUJET2.0 as future tests to help elucidating this ``tricky azimuthal dependence" of jet quenching seen at RHIC and LHC. (Reference: J. Xu, A. Buzzatti, and M. Gyulassy, ``Azimuthal Jet Flavor Tomography with CUJET2.0 of Nuclear Collisions at RHIC and LHC'', arXiv:1402.2956. To appear in JHEP. )