Dielectron production in Au + Au collisions from STAR (HardProbes '13 proceedings), J. Butterworth
October 31, 2014
Proceedings for the 2013 Hard Probes conference published in Nucl.Phys.A 932(2014)318 doi:10.1016/j.nuclphysa.2014.09.080
Abstract: We present the systematic study of dielectron production from minimum bias Au + Au collisions at √sNN=19.6, 39, and 62.4 GeV along with the production from minimum bias Au + Au collisions at 200 GeV for reference. The spectra are compared to simulated hadronic contributions that do not contain ρ-meson contributions. In each comparison, there is an excess in the dielectron yield that is consistent with a medium modified ρ -meson and shows no dependence on √sNN. To further understand the excess, the spectra are compared to the simulated hadronic contributions plus model calculations that include contributions from the medium and ρ-mesons with a broadened spectral function. These comparisons are consistent within uncertainties.
Abstract: We present the systematic study of dielectron production from minimum bias Au + Au collisions at √sNN=19.6, 39, and 62.4 GeV along with the production from minimum bias Au + Au collisions at 200 GeV for reference. The spectra are compared to simulated hadronic contributions that do not contain ρ-meson contributions. In each comparison, there is an excess in the dielectron yield that is consistent with a medium modified ρ -meson and shows no dependence on √sNN. To further understand the excess, the spectra are compared to the simulated hadronic contributions plus model calculations that include contributions from the medium and ρ-mesons with a broadened spectral function. These comparisons are consistent within uncertainties.