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T: Fachverband Teilchenphysik
T 36: Neutrino physics without accelerators III
T 36.5: Vortrag
Dienstag, 31. März 2020, 18:00–18:15, L-2.004
Search for new physics with unconventional double beta decay modes in GERDA Phase II — •Elisabetta Bossio for the GERDA collaboration — Physik-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 0νββ-decay of 76Ge, which would unambiguously demonstrate lepton number violation. A large variety of beyond the Standard Model physics can also manifest in the 2νββ region of the spectrum: models involving Majorons or
Lorentz violating physics predict shapes of the measured two-electrons spectrum different from the conventional shape. In GERDA Phase II, the liquid argon veto system allows to have marginal background in this region of the spectrum and makes the search for exotic processes
attractive. Possible deformations of the shape due to systematic uncertainties are investigated and a hybrid Bayesian-frequentist approach is used to include them in the results. The analysis of 32.1 kg·yr of 76Ge exposure will be presented. The half-life of 2νββ-decay of 76Ge is measured with the highest precision to date. Results on unconventional double beta decay modes will also be presented, half-lives of the
Majoron involving decays of the order of 1023-1024 years are probed and Lorentz invariance violation is tested with a sensitivity of 10−6 GeV on the parameter ȧof(3).
This work has been supported in part by the German Federal Min-istry for Education and Research (BMBF) and the German ResearchFoundation (DFG) via the SFB1258.