A new Limit for Axion Dark Matter with SPACE

TL;DR

This paper reports the first axion dark matter search in Germany using SPACE, setting new upper limits on axion-photon coupling in a specific mass range, surpassing previous constraints significantly.

Contribution

It introduces the SPACE experiment for axion detection and establishes the most stringent limits to date on axion-photon coupling in the targeted mass range.

Findings

No axion signal detected within the searched range.

Set new upper limits on axion-photon coupling, exceeding previous bounds.

Demonstrated the feasibility of the SPACE experiment in axion searches.

Abstract

The axion, which has yet to be discovered, is a promising candidate for dark matter that emerges from Peccei-Quinn theory. This article presents the search for axion dark matter with the "Student Project for an Axion Cavity Experiment" (SPACE), which is also the first one in Germany. The hypothetical particle was looked for in the mass range from $16.626~\mathrm{\mu eV}$ to $16.653~\mathrm{\mu eV}$, corresponding to a frequency range of 4.020 GHz to 4.027 GHz, using a resonant cavity in a peak magnetic field of 14 T. No significant signal was found, allowing us to exclude an axion-photon coupling $g_{a\gamma\gamma} = 14.6 \cdot 10^{-13}~\mathrm{GeV}^{-1}$ for the full mass range and $g_{a\gamma\gamma} = 2.811 \cdot 10^{-13}~\mathrm{GeV}^{-1}$ at peak sensitivity with a 95% confidence level. This limit surpasses previous constraints by more than two orders of magnitude.