Charm quarks in medium and their contribution to di-electron spectra in relativistic heavy ion collisions

Abstract

We study the dynamics of charm quarks in the partonic medium and its implication to the di-electron spectra in high energy heavy ion collisions. The charm quarks traversing a thermal medium is simulated by the relativistic Langevin equation for elastic scatterings of charm quarks by thermal partons in an expanding fireball. The transport coefficients of charm quarks are calculated by the in-medium T-matrix method, where a static heavy quark potential is used with parameters fitted by the lattice QCD results. The di-electron invariant mass spectra are computed in most central collisions and are compared to the STAR data. The angular correlations of di-electrons are almost the same in $p+p$ and Au+Au collisions in the mass range $1.1<M<2.5GeV/{\mathrm{c}}^2$ with the back-to-back feature. This means that the angular correlation is intact even with medium interaction at the RHIC energy.

Revtex 4, 10 pages, 7 figures. Accepted version to PRC

References in corpus (12)

• Energy Loss and Flow of Heavy Quarks in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Nonperturbative Heavy-Quark Diffusion in the Quark-Gluon Plasma
• Relativistic Brownian Motion
• Heavy-flavour spectra in high energy nucleus-nucleus collisions
• Open heavy flavor in Pb+Pb collisions at sqrt(s)=2.76 TeV within a transport model
• Comprehensive Interpretation of Thermal Dileptons at the SPS
• Dilepton mass spectra in p+p collisions at sqrt(s)= 200 GeV and the contribution from open charm
• Low Mass Dimuons Produced in Relativistic Nuclear Collisions
• Thermal Dimuon Yields at NA60
• D-Dbar Correlations as a sensitive probe for thermalization in high-energy nuclear collisions
• The effect of partonic wind on charm quark correlations in high-energy nuclear collisions
• Time parameters and Lorentz transformations of relativistic stochastic processes

Cited by in corpus (12)

• Heavy Flavor in Medium Momentum Evolution: Langevin vs Boltzmann
• Diffusion of ${\Lambda }_c$ in hot hadronic medium and its impact on ${\Lambda }_c/D$ ratio
• Heavy quark diffusion in pre-equilibrium stage of heavy ion collisions
• Heavy quark transport in an anisotropic hot QCD medium: Collisional and Radiative processes
• Heavy quark transport coefficients in a viscous QCD medium with collisional and radiative processes
• Tests of the Quark-Gluon Plasma Coupling Strength at Early Times with Heavy Quarks
• Dragging heavy quark in an anisotropic QCD medium beyond the static limit
• Impact of momentum-space anisotropy on heavy quark dynamics in a QGP medium
• Yield correlations and $p_T$ dependence of charm hadrons in Pb + Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV
• Elliptic flow of thermal dileptons in event-by-event hydrodynamic simulation
• Charmed hadron production via equal-velocity quark combination in ultra-relativistic heavy ion collisions
• Prompt production of D mesons with ALICE at the LHC