Search for New Physics in Electronic Recoil Data from XENONnT

We report on a blinded analysis of low-energy electronic recoil data from the first science run of the XENONnT dark matter experiment. Novel subsystems and the increased 5.9 ton liquid xenon target reduced the background in the (1, 30) keV search region to (15.8 +/- 1.3) events/(ton x year x keV), the lowest ever achieved in a dark matter detector and-5 times lower than in XENON1T. With an exposure of 1.16 ton-years, we observe no excess above background and set stringent new limits on solar axions, an enhanced neutrino magnetic moment, and bosonic dark matter.

Automated summary

We present a blinded analysis of low-energy electronic recoil data from the first science run of the XENONnT dark matter experiment. By employing novel subsystems and increasing the liquid xenon target to 5.9 tons, the background in the (1, 30) keV search region has been reduced to the lowest ever achieved in a dark matter detector, 5 times lower than that in XENON1T. With an exposure of 1.16 ton-years, no excess signal above background is observed, and stringent new limits on solar axions, an enhanced neutrino magnetic moment, and bosonic dark matter are set.