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Related Experiment Video

Updated: Jul 6, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

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Published on: July 27, 2018

Search for axionlike particles using a variable-baseline photon-regeneration technique.

A S Chou¹, W Wester, A Baumbaugh

¹Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA.

Physical Review Letters

|March 21, 2008

Summary

This summary is machine-generated.

The GammeV experiment searched for new particles using a light-shining-through-a-wall method. No evidence was found, setting new limits on the couplings of axionlike particles to photons.

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Area of Science:

Particle Physics
Experimental Physics
Cosmology

Background:

Axionlike particles are hypothetical particles proposed to solve problems in particle physics and cosmology.
Understanding their properties could shed light on dark matter and the early universe.

Purpose of the Study:

To search for milli-electron volt (eV) mass particles with axionlike couplings to two photons.
To constrain the coupling strengths of these hypothetical particles to photons.

Main Methods:

Utilized the GammeV experiment employing a "light shining through a wall" technique.
Varied the oscillation baseline to probe different particle masses.
Monitored for regenerated photons passing through an opaque barrier.

Main Results:

No significant excess of events above the expected background was observed.
Established upper limits on the two-photon couplings for massless axionlike particles: < 3.1x10^-7 GeV^-1 for scalar and < 3.5x10^-7 GeV^-1 for pseudoscalar particles.

Conclusions:

The GammeV experiment places stringent constraints on the properties of axionlike particles.
The results exclude a specific parameter space for these hypothetical particles, guiding future searches.