Speaker
Description
The High Acceptance DiElectron Spectrometer (HADES) is a fixed target experiment at GSI, Darmstadt, Germany, with large geometrical acceptance and high efficiency, dedicated to the studies of heavy-ions, proton and pion induced reactions. In February 2022, proton-proton reactions at 4.5 GeV beam kinetic energy were measured and $e^{+}e^{-}$ data was collected. The data allows to study the specific channels that produced dileptons, as baryonic resonance Dalitz decays $(\Delta / N^{*}\rightarrow pe^{+}e^{-})$ and vector meson decays $(\rho / \omega/\phi\rightarrow e^{+}e^{-})$. The measurement will also serve as a reference for in-medium effects observed in heavy-ion collisions at CBM and STAR Beam Energy Scan energies. In this contribution, the strategy for the identification of correlated electron-positron pairs and the rejection of combinatorial background will be discussed. The signal to background ratio in the vector meson region is larger than 10 and $\omega$ and $\phi$ peaks are clearly visible. In addition, $e^{+}e^{-}$ pairs are reconstructed in the high invariant mass region $(M_{e^{+}e^{-}} > 1020 \ \mathrm{MeV/c^2})$.
| Collaboration | HADES |
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