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T: Fachverband Teilchenphysik

T 45: Search for Dark Matter 2

T 45.5: Vortrag

Dienstag, 5. März 2024, 17:00–17:15, Geb. 30.35: HSI

Direct search for modulated Dark Matter signals with XENON1T — •Lutz Althueser for the XENON collaboration — Institute for Nuclear Physics, University of Münster, Germany

The XENON Dark Matter Project uses a dual-phase xenon time projection chamber (TPC) to directly search for Dark Matter (DM), such as weakly interacting massive particles (WIMPs). DM particles are expected to scatter off xenon nuclei in the active detector region, leading to nuclear and electronic recoils. The measured DM count rate is expected to modulate with a certain amplitude and phase.

The concept of annual modulation assumes that DM exists as a spherical and non-rotating halo in which the Earth and Sun are contained. Given the relative movement of the Sun, Earth and galactic center, one would expect a time-dependent DM interaction rate. Using this time dependent signature of the count rate provides an additional handle for the background discrimination, one of the biggest challenges of any direct detection DM experiment.

The talk will give an introduction to the characteristics of the event rate modulation under the Standard Halo Model and dives into the search for modulations over the runtime of the XENON1T experiment.

The work of the author is supported by Deutsche Forschungsgemeinschaft (DFG) through the Research Training Group "GRK 2149: Strong and Weak Interactions - from Hadrons to Dark Matter".

Keywords: XENON; dark matter; modulation; Standard Halo Model