New bounds and future prospects for axion force searches at Penning trap experiments

TL;DR

This paper demonstrates that current Penning trap experiments, which measure the electron's g-factor, can set new limits on axion-mediated forces, and proposes using electron-positron switching to improve detection sensitivity.

Contribution

It introduces a novel application of Penning trap experiments for probing axion forces and suggests methods to enhance experimental sensitivity and isolate axion effects.

Findings

Current electron g-factor measurements set new axion force limits.

Switching between electron and positron can isolate axion effects.

Penning traps are effective probes for axion-mediated interactions.

Abstract

In this note we consider Penning trap experiments as probes of axion-mediated forces. We show that the current measurement of electron's $g$-factor already sets a new exclusion limit for monopole-dipole axion forces acting on the electron spin. We also show that the Penning trap's capability of switching an electron and a positron can isolate the effect of an axion force and suppress systematic effects.