Speaker
Hendrik van Hees
(Goethe University Frankfurt and FIAS)
Description
Heavy charm and bottom quarks provide an important probe of the
transport properties of the quark-gluon plasma, created in heavy-ion
collisions at the Large Hadron Collider (LHC). They are produced in the
early hard collisions and then interact with the hot and dense medium,
consisting of light quarks and gluons, undergoing a phase transition to
a hot and dense hadron gas. Using a hybrid model of Ultrarelativistic
Molecular Dynamics (UrQMD) and 3D hydrodynamics to simulate the
evolution of the hot and dense medium, we describe heavy-quark
interactions with the medium in terms of a Fokker-Planck/Langevin
framework with drag and diffusion coefficients based on a
Dirac-Brueckner evaluation of the in-medium scattering-matrix elements
using lattice QCD heavy-quark potentials for elastic light-heavy-quark
scattering or a phenomenological resonance-scattering model based on
chiral and heavy-quark effective theory to evaluate the nuclear
modification factor, R_AA, and elliptic flow v_2 of D- and B-mesons and "non-photonic electrons" from their semileptonic decays.
The results are compared with recent data from the ALICE collaboration on R_AA and elliptic flow of single electrons, muons, and D-mesons, data on non-photonic electrons from the PHENIX Collaboration. We also study the impact of the corresponding medium modifications of D and $\overline{\mathrm{D}}$ mesons on the contribution of their correlated decay to the dilepton signal. This is particularly interesting, because in the intermediate $\ell^+ \ell^-$-invariant-mass region, $M_{\phi} < M_{\ell^+ \ell^-} < M_{J/\psi}$ this is the dominant dilepton source competing with "thermal radiation" from the QGP.
Finally we use the same HQ-diffusion model for predictions about similar signals of $\mathrm{D}$ and $\overline{\mathrm{D}}$ mesons to be expected at the future CBM experiment at FAIR.
| On behalf of collaboration: | None |
|---|
Author
Hendrik van Hees
(Goethe University Frankfurt and FIAS)
Co-authors
Jan Steinheimer
(Goethe University Frankfurt and FIAS)
Marcus Bleicher
(Goethe University Frankfurt and FIAS)
Thomas Lang
(Goethe University Frankfurt and FIAS)
