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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Instrumentation X

HK 28.7: Vortrag

Dienstag, 27. Februar 2018, 18:00–18:15, HZO 90

Di-Electron identification with the upgraded RICH detector at HADES — •Jan-Hendrik Otto for the HADES collaboration — Justus Liebig Universität Gießen

The HADES (High Acceptance DiElectron Spectrometer) detector, located at GSI, Darmstadt, has been built to study dense baryonic matter and hadronic properties such as form-factors using in particular electromagnetic probes. Currently several upgrades are done in order to improve the HADES performance at SIS18 during FAIR phase 0 experiments. The photon detector of the RICH detector is replaced by H12700 MAPMTs. In this contribution the expected performance of the RICH detector and studies of e⁺e⁻ pair identification in heavy ion collisions are presented: Simulated UrQMD events of semi-central (44 %) Ag+Ag collisions at 1.65 AGeV beam energy enriched with an additionally embedded PLUTO signal of vector-meson decays have been used for these studies. The high efficient ring finding of the upgraded RICH detector allows for so far unreached background suppression and enables the extraction of an invariant mass spectrum of di-electrons from 50 MeV/c² up to masses beyond the phi meson pole.