ALPS II reports no detection of axion-like particles and establishes improved 95% CL upper limits on di-photon couplings of 1.5e-9 GeV^-1 for masses below 0.1 meV, plus limits for scalar, vector, and tensor bosons.
Any Light Particle Searches with ALPS II: first science results
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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.
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Photon-axion conversion near Kerr black holes produces dimming of photon spectral luminosity that increases with black hole spin, magnetic field strength, and photon-axion coupling, most efficiently at high frequencies.
ALPS II's initial science run found no evidence for new bosons and set photon-boson conversion sensitivities at a few 10^{-13}.
A two-channel TES system for 1064 nm achieves 86% efficiency, <7% energy resolution, and <6 mHz background, allowing 5-sigma detection of signals at 2.7e-5 Hz (5e-24 W) in 20 days.
citing papers explorer
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Any Light Particle Searches with ALPS II: first science results
ALPS II reports no detection of axion-like particles and establishes improved 95% CL upper limits on di-photon couplings of 1.5e-9 GeV^-1 for masses below 0.1 meV, plus limits for scalar, vector, and tensor bosons.
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Dimming of Photon Ring due to Photon-Axion Conversion around Kerr Black Holes
Photon-axion conversion near Kerr black holes produces dimming of photon spectral luminosity that increases with black hole spin, magnetic field strength, and photon-axion coupling, most efficiently at high frequencies.
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Any Light Particle Searches with ALPS II: Description of the first science campaign
ALPS II's initial science run found no evidence for new bosons and set photon-boson conversion sensitivities at a few 10^{-13}.
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Characterization of a Two-Channel Optical and Near-infrared Transition Edge Sensor System for Rare-Event Searches
A two-channel TES system for 1064 nm achieves 86% efficiency, <7% energy resolution, and <6 mHz background, allowing 5-sigma detection of signals at 2.7e-5 Hz (5e-24 W) in 20 days.