Speaker
Description
A small collaboration between The University of Melbourne and Subatech has been working to quantify the sensitivity of XLZD to low mass WIMPs in the presence of the Migdal effect. We present preliminary results from this work, showing the exclusion and discovery power of XLZD at different milestones of operation under the 40 t to 60 t "French press" detector filling strategy. These projections utilise state-of-the-art atomic calculations for the Migdal effect in liquid xenon developed in collaboration with theorists at The University of Melbourne. We use a background model comprised of standard physics backgrounds under detector performance assumptions established in the 2025 Requirements Taskforce, in addition to the latest empirical model of accidental coincidences (ACs) developed by Nikhef. This latest version incorporates updates from the XLZD AC Taskforce, including new spectra from current-generation experiments and improvements to the scalings of different components with detector geometry. It also uses newly created light collection efficiency maps for the 40 t and 60 t geometries, generated using the ray tracing software ANTS2.