2007/02/28 by M. Thomère, C. Hartnack, G. Wolf +2
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.1103/physrevc.75.064902
published as Phys.Rev.C75:064902,2007 · 28 pages, 15 figures, 3 tables, ps file recommended
openalex publication_date 2007/06/04 · arxiv created 2007/07/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Recently the HADES Collaboration has published the invariant mass spectrum of e+e^\ensuremath- pairs, dN/dM_e+e^\ensuremath-, produced in C + C collisions at 2A GeV. Using electromagnetic probes, one hopes to get information from this experiment on hadron properties at high density and temperature. Simulations show that firm conclusions on possible in-medium modifications of meson properties will only be possible when the elementary meson production cross sections, especially in the pn channel, as well as production cross sections of baryonic resonances are better known. Presently one can conclude that (i) simulations overpredict by far the cross section at M_e+e^\ensuremath-\ensuremath≈M_\ensuremathω0 if free production cross sections are used and that (ii) the upper limit of the \ensuremathη decay into e+e^\ensuremath- is smaller than the present upper limit of the Particle Data Group. This is the result of simulations using the isospin quantum molecular dynamics approach.