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

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