Improved constraints on the coupling constants of axion-like particles to nucleons from recent Casimir-less experiment

TL;DR

This study uses a Casimir-less experiment to set new, significantly tighter constraints on axion-like particles' coupling to nucleons across a broad mass range, improving previous limits substantially.

Contribution

The paper introduces improved experimental constraints on axion-like particles' nucleon coupling constants derived from Casimir-less force measurements.

Findings

Constraints are up to 60 times stronger than previous limits.

Effective for axion masses from 1.7 meV to 0.9 eV.

Utilizes differential force measurements between Au and Si sectors.

Abstract

We obtain improved constraints on the coupling constants of axion-like particles to nucleons from a recently performed Casimir-less experiment. For this purpose, the differential force between a Au-coated sphere and either Au or Si sectors of a rotating disc, arising due to two-axion exchange, is calculated. Over a wide region of axion masses from 1.7 meV to 0.9 eV the obtained constraints are stronger up to a factor of 60 than the previously known ones following from the Cavendish-type experiment and measurements of the effective Casimir pressure.