Any Light Particle Searches with ALPS II: first science results
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.
Cite
@article{arxiv.2512.14110,
title = {Any Light Particle Searches with ALPS II: first science results},
author = {Daniel C. Brotherton and Zachary R. Bush and Sandy Croatto and Mauricio Diaz-Ortiz and Jacob Egge and Aldo Ejlli and Henry Frädrich and Joe Gleason and Hartmut Grote and Ayman Hallal and Michael T. Hartman and Harold Hollis and Katharina-Sophie Isleif and Alasdair L. James and Friederike Januschek and Kanioar Karan and Sven Karstensen and Todd Kozlowski and Axel Lindner and Giuseppe Messineo and Manuel Meyer and Guido Müller and Ryan Netrval and Isabella Oceano and Gulden Othman and Jan H. Põld and David Reuther and Andreas Ringwald and Elmeri Rivasto and José Alejandro Rubiera Gimeno and Jörn Schaffran and Uwe Schneekloth and Christina Schwemmbauer and Richard C. G. Smith and Aaron D. Spector and David B. Tanner and Dieter Trines and Li-Wei Wei and Benno Willke and Rachel Wolf},
journal= {arXiv preprint arXiv:2512.14110},
year = {2026}
}
Comments
9 pages, 6 figures