Physical Review Letters· 2026Q1
Any-light-particle searches with ALPSII: First science results
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- Q1SCImago
- 2026year
Short summary
The ALPS II experiment at DESY found no evidence for new light particles (axions and similar bosons) and set a new world-leading limit on their di-photon coupling strength (1.5e-9 1/GeV at 95% CL), over 20 times better than previous experiments.
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Key points
- No evidence for light particles (axions, pseudoscalar bosons) was found in the ALPS II experiment's first science campaign.
- A new world-leading limit for the di-photon coupling strength of pseudoscalar bosons (<0.1 meV) was set at 1.5e-9 1/GeV (95% CL).
- This new limit is over 20 times stronger than previous experimental results.
- The experiment also established limits for scalar, vector, and tensor bosons and demonstrated stable operation and calibration.
AI-generated from the title and abstract; the full text is not read.
Abstract
The light-shining-through-a-wall experiment ALPS II at DESY in Hamburg searched for axions and similar lightweight particles in its first science campaign from February to May 2024. No evidence for the existence of such particles was found. For pseudoscalar bosons like the axion, with masses below about 0.1 meV, we achieved a limit for the di-photon coupling strength of 1.5e-9 1/GeV at a 95% confidence level. This is more than a factor of 20 improvement compared to all previous similar experiments. We also provide limits on photon interactions for scalar, vector and tensor bosons. An achievement of this first science campaign is the demonstration of stable operation and robust calibration of the complex experiment. Currently, the optical system of ALPS II is being upgraded aiming for another two orders of magnitude sensitivity increase.
The authors' abstract, as published at the source. Physical Review Letters, 2026 · DOI ↗
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Field: Nuclear and High Energy Physics
Nuclear and High Energy PhysicsPhysics and Astronomy