Speaker
Description
The XENONnT experiment, a dual-phase Xenon Time Projection Chamber (TPC) of 5.9t active mass operating at the Laboratori Nazionali del Gran Sasso (LNGS), is at the forefront of the search for direct dark matter detection. Thanks to its unprecedented radioactive purity and enhanced veto system, it is best positioned to explore new physics at the low-energy frontier. We present here the latest results from first science runs, reaching exposures up to 7.8t$\times$y.
We highlight a novel, blinded search for light dark matter using ionization(S2)-only signals. Supported by dedicated background suppression techniques and a first complete S2-only background model, this analysis achieves sensitivity down to sub-keV energies, providing world-leading constraints on light WIMPs, dark photons, axion-like particles and dark matter–electron scattering.
We also report a 3.3$\sigma$ measurement of coherent elastic neutrino-nucleus scattering (CE$\nu$NS) from solar $^8$B neutrinos, inferring a solar $^8$B neutrino flux and a weak mixing angle at low momentum transfer consistent with previous measurements. This result probes the emerging "neutrino fog" that will ultimately limit the sensitivity of future dark matter experiments.
After completing recently a major detector upgrade, XENONnT is now resuming operation with a data-taking efficiency expected to be significantly better compared to first runs. We outline the future perspectives for both dark matter searches and neutrino physics with upcoming data in this improved detector configuration.