Dileptons and Photons from Coarse-Grained Microscopic Dynamics and Hydrodynamics Compared to Experimental Data
P. Huovinen, M. Belkacem, P. J. Ellis, J. I. Kapusta
Abstract
Radiation of dileptons and photons from high energy nuclear collisions provides information on the space-time evolution of the hot dense matter produced therein. We compute this radiation using relativistic hydrodynamics and a coarse-grained version of the microscopic event generator UrQMD, both of which provide a good description of the hadron spectra. The currently most accurate dilepton and photon emission rates from perturbative QCD and from experimentally-based hadronic calculations are used. Comparisons are made to data on central Pb-Pb and Pb-Au collisions taken at the CERN SPS at a beam energy of 158 A GeV. Both hydrodynamics and UrQMD provide very good descriptions of the photon transverse momentum spectrum measured between 1 and 4 GeV, but slightly underestimate the low mass spectrum of e+e- pairs, even with greatly broadened rho and omega vector mesons. Predictions are given for the transverse momentum distribution of dileptons.
Create a lesson
Related papers
Prospects for modelling odd and odd-odd nuclei using energy density functionals
A. V. Afanasjev, B. Bally, M. Bender et al.
Fast Monte Carlo calculation of multiple scattering in resonant neutron capture
R. M. Djilkibaev
Constraining three-nucleon forces in nuclear lattice effective field theory
Serdar Elhatisari, Ulf-G. Meißner, Zhengxue Ren et al.
Collective-flow signatures of bubble nuclei in intermediate-energy projectile fragmentation reactions
Ge Ren, Chun-Wang Ma, Xi-Guang Cao et al.
R-process nuclei in the rare-earth region above N=126 in Relativistic Hartree-Bogoliubov theory: A preponderance of shape-coexistence in nuclei
M. M. Sharma
Binding energies in the 0-+ and 1-- fermion--antifermion channels from the ladder Bethe-Salpeter and Schrödinger equations
Wei He, Hai-Qing Zhou