K. Teilab

TL;DR: HADES as discussed by the authors is a versatile magnetic spectrometer aimed at studying dielectron production in pion, proton and heavy-ion-induced collisions, which includes a ring imaging gas Cherenkov detector for electron-hadron discrimination, a tracking system consisting of a set of 6 superconducting coils producing a toroidal field and drift chambers, and a multiplicity and electron trigger array for additional electron hadron discrimination.

TL;DR: HADES as discussed by the authors is a versatile magnetic spectrometer aimed at studying dielectron production in pion, proton and heavy-ion induced collisions, which includes a ring imaging gas Cherenkov detector for electron-hadron discrimination, a tracking system consisting of a set of 6 superconducting coils producing a toroidal field and drift chambers and a multiplicity and electron trigger array for additional electron hadron discrimination and event characterization.

TL;DR: In this paper, an upper bound on the branching ratio of the helicity-suppressed direct decay of the η meson η → e + e − was obtained for the mass range M(U)= 0.02 - 0.55 GeV/c 2 and is compared with the present world data set.

TL;DR: In this paper, the emission of e+ e- pairs from C + C collisions at an incident energy of 1 GeV per nucleon has been investigated, and measured production probabilities, spanning from the π0-Dalitz to the ρ / ω invariant mass region, display a strong excess above the cocktail of standard hadronic sources.

TL;DR: In this paper, the ω multiplicity has been extracted and compared to the yields of other particles, in particular of the φ meson, for the first time ω mesons could be reconstructed in a heavy ion reaction at a bombarding energy which is well below the production threshold in free nucleon-nucleon collisions.