暗黒物質の探求を前進させる： LUX-ZEPLIN実験からの新たな知見(Advancing the quest for dark matter: New insights from the LUX-ZEPLIN experiment)

2024-08-26 ブラウン大学

＜関連情報＞

• https://www.brown.edu/news/2024-08-26/dark-matter-lz
• https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.041002

LUX-ZEPLIN（LZ）実験による初のダークマター探索結果 First Dark Matter Search Results from the LUX-ZEPLIN (LZ) Experiment

J. Aalbers et al. (LUX-ZEPLIN Collaboration)
Physical Review Letters  Published 28 July 2023
DOI:https://doi.org/10.1103/PhysRevLett.131.041002

Abstract

The LUX-ZEPLIN experiment is a dark matter detector centered on a dual-phase xenon time projection chamber operating at the Sanford Underground Research Facility in Lead, South Dakota, USA. This Letter reports results from LUX-ZEPLIN’s first search for weakly interacting massive particles (WIMPs) with an exposure of 60 live days using a fiducial mass of 5.5 t. A profile-likelihood ratio analysis shows the data to be consistent with a background-only hypothesis, setting new limits on spin-independent WIMP-nucleon, spin-dependent WIMP-neutron, and spin-dependent WIMP-proton cross sections for WIMP masses above 9  GeV/c². The most stringent limit is set for spin-independent scattering at 36  GeV/c², rejecting cross sections above 9.2×10⁻⁴⁸cm² at the 90% confidence level.