Abstract
Gerda is an experiment designed to look for the neutrinoless double beta decay of 76Ge. The experiment uses an array of high-purity germanium detectors (enriched in 76Ge) directly immersed in liquid argon. Gerda is presently operating eight enriched coaxial detectors (approximately 15 kg of 76Ge) and about 25 new custom-made enriched BEGe detectors will be deployed in the next phase (additional 20kg of 76Ge). The paper describes the Gerda off-line analysis of the high-purity germanium detector data. Firstly we present the signal processing flow, focusing on the digital filters and on the algorithms used. Secondly we discuss the rejection of non-physical events and the data quality monitoring. The analysis is performed completely with the Gerda software framework (Gelatio), designed to support a multi-channel processing and to perform a modular analysis of digital signals.
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