P. Cabanelas

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: The invariant mass spectrum of e{sup +}e{sup -} pairs produced in {sup 12C+{sup 12}C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time as mentioned in this paper.

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.