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Toward a solution to the R_(AA) and v₂ puzzle for heavy quarks
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Toward a solution to the R_(AA) and v₂ puzzle for heavy quarks
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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 \rightarrow\ T_c \,$ is a major ingredient for a simultaneous description of $R_{AA}(p_T)$ and $v_2(p_T)$.
Forward citations
Cited by 5 Pith papers
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Momentum Dependence of Heavy Quark Diffusion in a Thermal Gluonic Plasma on the Lattice
A lattice QCD method is proposed to compute the momentum dependence of heavy quark drag and diffusion coefficients in a thermal gluonic plasma.
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Momentum Dependence of Heavy Quark Diffusion in a Thermal Gluonic Plasma on the Lattice
Lattice simulations of a 3D effective gluonic plasma theory produce the first reported momentum dependence of heavy quark drag and diffusion coefficients in a non-perturbative non-Abelian thermal medium.
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Bayesian Inference of Heavy-Quark Dissipation and Jet Transport Parameters from D-Meson observables in heavy-ion collisions at the LHC energies
First simultaneous Bayesian extraction of 2πT D_s and q-hat/T^3 from D-meson R_AA and v2 at 5.02 TeV, yielding a non-monotonic temperature dependence in their ratio that deviates from the expected value of 2.
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Sensitivity of Heavy-Quark Dipolar Flow to its Initial Spatial Distributions in Cu+Au Collisions
In Cu+Au collisions, heavy-quark directed flow is an order of magnitude larger than charged-hadron flow and shows strong sensitivity to initial spatial distributions and temperature-dependent drag.
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Jet cone size dependence of single inclusive jet suppression due to jet quenching in Pb+Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV
Jet nuclear modification factor R_AA increases with cone radius R as in-cone energy loss from elastic recoils and radiated gluons decreases at larger radii.
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