Abstract
We present the first combined study of correlators and spectral properties of charmonium and open-charm-mesons at finite temperature using a fully relativistic lattice QCD approach. The QCD medium is captured by second generation anisotropic 24^3xN_t lattices from the FASTSUM collaboration, including 2+1 flavors of clover discretized quarks with m_pi~380 MeV. Two Bayesian methods are deployed to reconstruct the spectral functions, the recent BR method as well as the Maximum Entropy Method with Fourier basis. We take particular care to disentangle genuine in-medium effects from method artifacts with the help of the reconstructed correlator. Consistent with the direct inspection of correlators, we observe no significant in-medium modification for J/Psi and eta_c around the crossover, while the chi_c states on the other hand show clear changes around the transition. At the highest temperature, T=352 MeV, J/Psi and eta_c also exhibit discernible changes compared to the vacuum. For D mesons around $T_c$, no significant modifications are observed, but we find clear indications that no bound state survives at the highest temperature of T=352 MeV. Above T_c we discover a significant difference between D and D* mesons, the latter being much more strongly affected by the medium.
Highlights
We present the first combined study of correlators and spectral properties of charmonium and open charm mesons at finite temperature using a fully relativistic lattice QCD approach
Heavy quarks and the mesons formed by binding these to pairs with either light or other heavy quarks are an essential part of our toolset to probe the physics of the quark-gluon plasma in relativistic heavy-ion collisions at RHIC and LHC
We have presented a combined analysis of charmonium and open charm meson properties in a thermal medium based on fully relativistic lattice discretized heavy quarks
Summary
We present the first combined study of correlators and spectral properties of charmonium and open charm mesons at finite temperature using a fully relativistic lattice QCD approach. Consistent with the direct inspection of correlators, we observe no significant in-medium modification for J=Ψ and ηc around the crossover, while the χc states on the other hand show clear changes around the transition. For D mesons around Tc, no significant modifications are observed, but we find clear indications that no bound state survives at the highest temperature of T 1⁄4 352 MeV. Direct perturbative analysis of energy loss in a thermal medium [12], computations based on a DysonSchwinger–like T-matrix resummation [13], as well as modeling with microscopic kinetic equations [14] have provided further insightful results
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