Direction-sensitive dark matter search with three-dimensional vector-type tracking in NEWAGE

TL;DR

This paper reports on a direction-sensitive dark matter search using a 3D vector tracking detector, setting the most stringent upper limit to date on WIMP-proton interactions at Kamioka Observatory.

Contribution

The study introduces a new gamma-ray rejection and head-tail determination analysis in a gaseous TPC for dark matter detection.

Findings

No significant non-isotropic signal detected.

Established a 90% CL upper limit of 25.7 pb on WIMP-proton cross section.

Achieved the most stringent limit in direction-sensitive dark matter searches.

Abstract

NEWAGE is a direction-sensitive dark matter search experiment with a three-dimensional tracking detector based on a gaseous micro time projection chamber. A direction-sensitive dark matter search was carried out at Kamioka Observatory with a total live time of 318.0 days resulting in an exposure of 3.18 kg$\cdot$days. A new gamma-ray rejection and a head-tail determination analysis were implemented for this work. No significant non-isotropic signal from the directional analysis was found and a 90% confidence level upper limit on spin-dependent WIMP-proton cross section of 25.7 pb for WIMP mass of 150 GeV/c2 was derived. This upper limit is the most stringent in the direction-sensitive dark matter searches.