2014/09/19 by Patrick Huck
Physics and Astronomy · #Astrophysics #Baryon #Beam (structure) #Beam energy #Hadron #High-Energy Particle Collisions Research #Invariant mass #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Star (game theory) #Yield (engineering) #hep-ex #nucl-ex
paper · pdf · doi:10.1016/j.nuclphysa.2014.09.090
4 pages, 3 figures, to be published in Nuclear Physics A, Proceedings of Quark Matter Conference 2014, see http://qm2014.gsi.de/
arxiv created 2014/09/19 · openalex publication_date 2014/10/02 · arxiv updated 2019/08/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present the energy-dependent study of dielectron production in 0-80% minimum-bias Au+Au collisions at √sNN energies of 19.6, 27, 39, and 62.4 GeV in STAR. Invariant mass (Mee) and transverse momentum (pT) differential measurements of dielectron yields are compared to cocktail simulations of known hadronic sources and semi-leptonic charmed decays. The enhancement (excess yield) prominent in the Low-Mass Region (LMR) over the cocktail at all energies, is further compared to calculations of ρ in-medium modifications. Within statistical and systematic uncertainties, we find that the model consistently describes this enhancement from SPS up to top RHIC energies in its Mee- as well as pT-dependence. Dielectron measurements drive the statistics for the future BES Phase-II program, which promises to improve our understanding of the LMR enhancement's trend with total baryon densities.