Low mass dilepton production at ultrarelativistic energies
نویسنده
چکیده
Dilepton production in pp and Au+Au nucleus-nucleus collisions at √ s = 200 GeV as well as in In+In and Pb+Au at 158 A·GeV is studied within the microscopic HSD transport approach. A comparison to the data from the PHENIX Collaboration at RHIC shows that standard in-medium effects of the ρ, ω vector mesons compatible with the NA60 data for In+ In at 158 A·GeV and the CERES data for Pb+Au at 158 A·GeV do not explain the large enhancement observed in the invariant mass regime from 0.2 to 0.5 GeV in Au + Au collisions at √ s = 200 GeV relative to pp collisions.
منابع مشابه
ar X iv : n uc l - th / 9 90 71 18 v 1 3 0 Ju l 1 99 9 Transport calculation of dilepton production at ultrarelativistic energies
Dilepton spectra are calculated within the microscopic transport model UrQMD and compared to data from the CERES experiment. The invariant mass spectra in the mass region between 300 and 600 MeV depend strongly on the mass dependence of the ρ meson decay width which is not sufficiently determined by the Vector Meson Dominance (VMD) model. A consistent explanation of both the recent Pb+Au data a...
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تاریخ انتشار 2008