Speaker
Description
Relativistic nucleus-nucleus collisions offer a unique possibility for studying nuclear matter under the influence of high temperature and pressure. During the collision, a system of interacting nucleons, resonances, and mesons, called a hadronic fireball, is created.
The Dielectron Spectrometer HADES operated at the SIS18 synchrotron of FAIR/GSI, Darmstadt provided new intriguing results on the production of electron pairs and strangeness from nucleus-nucleus collisions, as well as from reference elementary reactions, in the energy region of 1 - 2 A GeV. In 2019 HADES was complemented by a new electromagnetic calorimeter based on lead-glass modules, which allows to measure production of the $\pi^0$ and $\eta$ mesons via their two $\gamma$ decays. In this energy range, $\pi^0$ and $\eta$ mesons are the most abundantly produced mesons carrying information from the hadronic fireball. In addition, the knowledge of the neutral meson production is a mandatory prerequisite for the interpretation of dielectron data and at the same time almost no respective data are presently available for this energy range.
Recent results on $\pi^0$ and $\eta$ production in Ag + Ag collisions at 1.58 A GeV with $14\times10^9$ collected events will be presented along with HADES experiment short overview. The yields, transverse momentum and rapidity distributions will be shown as well as first results for the neutral pion flow.
| Topic | Heavy Ion Physics |
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