Speaker
Description
XENONnT is a dark matter direct detection experiment located at Laboratori Nazionali del Gran Sasso. Featuring a xenon target of 8.5 tonnes, XENONnT utilizes a time projection chamber to detect Weakly Interacting Massive Particles (WIMPs). To further reduce the detection threshold, a method using ionization signals (S2-only) is adopted. This enables sensitivity to nuclear recoils down to 0.5 keV and to electronic recoils down to 0.04 keV, at the cost of additional backgrounds, such as instrumental backgrounds from cathode events, delayed electrons (DE), and accidental coincidence (AC) pile‑up. To address this, we develop the first complete S2-only background model using novel machine learning techniques. A search was then performed using 579 days of data totaling 7.8 tonne·years, and no significant excess is observed. In this presentation, I will talk about the first low-mass dark matter search with a complete S2-only background model in XENONnT, discuss the background modelling and results on a variety of dark matter models
| 请选择分会 | 中微子物理、粒子天体物理与宇宙学 |
|---|
