The QCD vacuum shows the dynamical breaking of chiral symmetry. In the hot and/or dense
QCD medium, the chiral order parameter such as⟨ q¯ q⟩ is expected to change as a …

HADES is a versatile magnetic spectrometer aimed at studying dielectron production in pion,
proton and heavy-ion-induced collisions. Its main features include a ring imaging gas …

The invariant-mass spectrum of e+ e-pairs produced in C 12+ C 12 collisions at an incident
energy of 2 GeV per nucleon has been measured for the first time. The measured pair …

The emission of e+ e− pairs from C+ C collisions at an incident energy of 1 GeV per nucleon
has been investigated. The measured production probabilities, spanning from the π0-Dalitz …

We review essential elements in using the JP= 1− channel as a probe for hot and dense
matter as produced in (ultra-) relativistic collisions of heavy nuclei. The uniqueness of the …

$\mathbf {Purpose} $: Incoherent processes in production of lepton pairs in the scattering of
protons off nuclei are investigated. $\mathbf {Methods} $: New quantum mechanical model …

In this study, we analyse the Л-Л hyperon channel in proton-proton scattering, pp↦→ ЛЛ+
K+K+, Л↦→ p+ π−, with a proton beam energy of 4.5 GeV using the High Acceptance Di …

Am Dielektronenspektrometer HADES (High Acceptance Di-Electron Spectrometer) am
Schwerionensynchrotron SIS der Gesellschaft für Schwerionenforschung (GSI) in Darmstadt …

ZUSAMMENFASSUNG Ein wesentlicher Forschungsgegenstand der Kernphysik ist die
Untersuchung der Eigenschaften von Kernmaterie. Das Verständnis daruber gibt in Teilen …

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⩽ M ee⩽ …