München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Astroparticle Physics I

HK 23.5: Vortrag

Dienstag, 19. März 2019, 15:30–15:45, HS 18

Probing new physics with double-beta decay in Gerda Phase II — •Elisabetta Bossio for the GERDA collaboration — PhyPhysik-Department , Technische Universität München, James-Franck-Straße, 85748 Garching

The main goal of the GERmanium Detector Array (Gerda) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy) is the discovery of the neutrinoless double-beta (0νββ) decay of ⁷⁶Ge. In Gerda Phase II, the Liquid Argon veto system and the Pulse Shape Discrimination (PSD) allow to have marginal background in the 2νββ-decay dominated region of the spectrum. This makes the search for other exotic processes attractive: models involving Majorons or Lorentz violating physics predict different shapes of the measured spectrum. Systematic uncertanties due to the background modeling are expected to be small. On the other hand different sources of systematics related to detector physics become important. A study of the dominant systematics and their impact on the sensitivity for new physics will be presented.

This work has been supported in part by the German Federal Ministry for Education and Research (BMBF) and the German Research Foundation (DFG) via the SFB1258.