HAL : in2p3-00276559, version 1
 arXiv : 0804.3993
 Quark Matter 2008, Jaipur : Inde (2008)
 Dielectron Production in $^{12} C+^{12}C$ Collisions at 1 GeV/u and the Solution to the DLS Puzzle
 The production of e+e- pairs in $^{12}C+^{12}C$ collisions at 1 GeV/u was investigated with the HADES experiment at GSI, Darmstadt. In the invariant-mass region $0.15\: GeV/c^{2} \leq M_{ee} \leq 0.5\: GeV/c^{2}$ the measured pair yield shows a strong excess above the contribution expected from hadron decays after freeze-out. The data are in good agreement with the results of the former DLS experiment for the same system and energy.