Event data model and reconstruction for direct dark matter search with DarkSide-20k

Overview & Synopsis

DarkSide-20k is the next generation dual-phase TPC of the DarkSide programme with 50 ton underground argon target, currently under construction at LNGS (Italy). With data taking to begin in 2027, DarkSide-20k will achieve cross-section discovery sensitivity of 10(-47) cm² searching for interactions of WIMPs with 0.1 TeV/c² mass. The sensitivity projection relies on innovative technologies, such as low-noise high-efficiency Silicon Photomultipliers and argon extracted from deep underground, and on the powerful scintillation pulse shape discrimination. In this thesis, the motivation for the direct dark matter search and a comprehensive description of the DarkSide-20k detector will be first introduced. This is followed by a description of my contributions to the definition of the event data model, development and optimisation of online signal processing, and data reconstruction. Then, the sensitivities to light dark matter particles are presented for both DarkSide-20k and its predecessor, DarkSide-50. Finally, ancillary topics such as the design, commissioning, and data analysis of a neutron detector configuration for the purpose of characterising the liquid argon low-energy response are also addressed.