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arxiv: 2601.18684 · v3 · pith:PM52ENT6new · submitted 2026-01-26 · ✦ hep-ex

Any Light Particle Searches with ALPS II: Description of the first science campaign

Aaron D. Spector , Daniel C. Brotherton , Ayman Hallal , Henry Fr\"adrich , Jacob Egge , Li-Wei Wei , Todd Kozlowski , Kanioar Karan
show 18 more authors
Zachary R. Bush Mauricio Diaz-Ortiz Jr. Aldo Ejlli Joe Gleason Hartmut Grote Michael T. Hartman Harold Hollis Katharina-Sophie Isleif Alasdair L. James Giuseppe Messineo Guido Mueller Ryan Netrval Isabella Oceano Jan H. P\~old Richard C. G. Smith David B. Tanner Benno Willke Axel Lindner
This is my paper

Pith reviewed 2026-05-21 15:10 UTC · model grok-4.3

classification ✦ hep-ex
keywords ALPS IIlight-shining-through-a-wallpseudo-Goldstone bosonsaxion-like particlesphoton-boson conversionheterodyne detectionsuperconducting magnets
0
0 comments X

The pith

ALPS II reached photon-boson conversion sensitivities of a few 10^{-13} in its first science campaign and found no evidence for new bosons.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper describes the first science campaign of the ALPS II experiment, which searched for pseudo-Goldstone bosons beyond the Standard Model using the light-shining-through-a-wall method. Laser light passed through over 100 meters of superconducting magnets, could convert to a bosonic field, traverse a wall, and convert back to photons, with a high-finesse cavity and heterodyne detection to measure any signal. Two polarization states were tested from February to May 2024. No signal appeared above background, but the setup achieved conversion probability sensitivities around 10^{-13}. A planned upgrade targets four orders of magnitude better reach.

Core claim

In its first science campaign, ALPS II directed laser light through one string of superconducting dipole magnets, through a wall, and into a second magnet string equipped with a high-finesse optical cavity and heterodyne detection. Searches were performed with the laser polarization perpendicular and parallel to the magnetic field. No evidence for the existence of new bosons was found, and the experiment reached photon-boson conversion probability sensitivities of a few 10^{-13}.

What carries the argument

The light-shining-through-a-wall technique, in which photons convert to and from a bosonic field inside strong magnetic fields on either side of an opaque wall, with resonant cavity enhancement after the wall.

If this is right

  • Upper limits can be derived on the coupling of pseudo-Goldstone bosons to photons as a function of their mass.
  • The null result constrains regions of parameter space for axion-like particles that are inaccessible to accelerator experiments.
  • The demonstrated performance validates the overall approach for future runs with higher sensitivity.
  • The two polarization configurations provide independent checks on the expected magnetic-field-dependent conversion.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Future runs at improved sensitivity could begin to test whether such bosons could account for a fraction of dark matter.
  • The achieved and targeted sensitivities allow direct comparison with astrophysical bounds on light bosons from stellar cooling or supernova observations.
  • Null results tighten the case that any new light particles must have couplings much weaker than the Standard Model forces.

Load-bearing premise

The heterodyne detection system and optical cavity are calibrated such that any real conversion signal would be distinguishable from noise and background at the quoted sensitivity.

What would settle it

Detection of excess power after the wall at a level corresponding to a conversion probability of a few 10^{-13} in either polarization configuration would indicate a real signal rather than background.

Figures

Figures reproduced from arXiv: 2601.18684 by Aaron D. Spector, Alasdair L. James, Aldo Ejlli, Axel Lindner, Ayman Hallal, Benno Willke, Daniel C. Brotherton, David B. Tanner, Giuseppe Messineo, Guido Mueller, Harold Hollis, Hartmut Grote, Henry Fr\"adrich, Isabella Oceano, Jacob Egge, Jan H. P\~old, Joe Gleason, Kanioar Karan, Katharina-Sophie Isleif, Li-Wei Wei, Mauricio Diaz-Ortiz Jr., Michael T. Hartman, Richard C. G. Smith, Ryan Netrval, Todd Kozlowski, Zachary R. Bush.

Figure 1
Figure 1. Figure 1: FIG. 1: Side view of the design of the full ALPS II experimental system. The HPL beam and PC [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2: Top down view of the optical system used during the ALPS II first science campaign. [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: Frequencies of the lasers and PLLs. [PITH_FULL_IMAGE:figures/full_fig_p011_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4: Flow chart of the analysis for the science PD data. The data first undergo the process [PITH_FULL_IMAGE:figures/full_fig_p012_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5: (a) [PITH_FULL_IMAGE:figures/full_fig_p014_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6: The COB layout for the first science campaign during open-shutter mode is shown in the [PITH_FULL_IMAGE:figures/full_fig_p017_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7: The HPL power measured exiting the [PITH_FULL_IMAGE:figures/full_fig_p022_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8: Magnitude squared (a) and phase (b) [PITH_FULL_IMAGE:figures/full_fig_p023_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9: Magnitude squared (a) and phase (b) [PITH_FULL_IMAGE:figures/full_fig_p024_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10 [PITH_FULL_IMAGE:figures/full_fig_p030_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11 [PITH_FULL_IMAGE:figures/full_fig_p031_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: FIG. 12 [PITH_FULL_IMAGE:figures/full_fig_p033_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: FIG. 13 [PITH_FULL_IMAGE:figures/full_fig_p034_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: FIG. 14: Results of Monte-Carlo simulations of [PITH_FULL_IMAGE:figures/full_fig_p035_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: FIG. 15: Histograms of the [PITH_FULL_IMAGE:figures/full_fig_p036_15.png] view at source ↗
Figure 16
Figure 16. Figure 16: FIG. 16: Moving average of the calibrated closed to open shutter ratio on the complex plane measured [PITH_FULL_IMAGE:figures/full_fig_p040_16.png] view at source ↗
Figure 17
Figure 17. Figure 17: FIG. 17: Moving average of the calibrated closed to open shutter ratio on the complex plane measured [PITH_FULL_IMAGE:figures/full_fig_p041_17.png] view at source ↗
Figure 18
Figure 18. Figure 18: FIG. 18: The mean open shutter signal (a) and closed shutter background (b) for S [PITH_FULL_IMAGE:figures/full_fig_p043_18.png] view at source ↗
Figure 19
Figure 19. Figure 19: FIG. 19: The estimated resonant enhancement [PITH_FULL_IMAGE:figures/full_fig_p045_19.png] view at source ↗
Figure 20
Figure 20. Figure 20: FIG. 20: The measured detuning ∆ [PITH_FULL_IMAGE:figures/full_fig_p050_20.png] view at source ↗
Figure 21
Figure 21. Figure 21: FIG. 21: The field overlap between the HPL and RC measured at the science detector and veto [PITH_FULL_IMAGE:figures/full_fig_p056_21.png] view at source ↗
Figure 22
Figure 22. Figure 22: FIG. 22: Changes in the magnitude and angle of [PITH_FULL_IMAGE:figures/full_fig_p062_22.png] view at source ↗
Figure 23
Figure 23. Figure 23: FIG. 23: Leakage from the signal bin into neigh [PITH_FULL_IMAGE:figures/full_fig_p063_23.png] view at source ↗
Figure 24
Figure 24. Figure 24: FIG. 24: The stray-light signal from S [PITH_FULL_IMAGE:figures/full_fig_p064_24.png] view at source ↗
read the original abstract

From February to May of 2024 the Any Light Particle Search II (ALPS II) conducted its first science campaign using the `light-shining-through-a-wall' technique to search for pseudo-Goldstone bosons that lie beyond the Standard Model of particle physics and which are inaccessible by accelerator-based experiments. The experimental setup consists of two strings of superconducting dipole magnets, each more than 100 m long, that are separated by a wall. Laser light is directed through the first magnet string and a heterodyne detection system is used to measure the electromagnetic power that traverses a wall via the conversion to and then from a bosonic field. After the wall, a high-finesse optical cavity resonantly enhances the signal power. Two searches were carried out, one with the laser polarized perpendicular to the magnetic field direction and another with its polarization state aligned parallel to the magnetic field. No evidence for the existence of new bosons was found. In its first science campaign, ALPS II reached photon-boson conversion probability sensitivities of a few $10^{-13}$. The ongoing upgrade of the optical system aims to increase this sensitivity by about four orders of magnitude.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 2 minor

Summary. The manuscript describes the first science campaign of the ALPS II experiment (February–May 2024), which employs the light-shining-through-a-wall technique to search for pseudo-Goldstone bosons. Two >100 m strings of superconducting dipole magnets are separated by a wall; laser light traverses the first string, and any converted bosons would reconvert to photons after the wall. A high-finesse optical cavity resonantly enhances the regenerated photon power, which is measured with a heterodyne detection system. Separate runs were performed with the laser polarization perpendicular and parallel to the magnetic field. No evidence for new bosons was observed, yielding a photon-boson conversion probability sensitivity of a few 10^{-13}. The paper also outlines an ongoing optical-system upgrade intended to improve sensitivity by roughly four orders of magnitude.

Significance. If the quoted sensitivity is supported by a complete calibration chain, background model, and systematic uncertainty budget, the work constitutes a valuable technical milestone. It demonstrates the integration and operation of the long magnet strings, high-finesse cavity, and heterodyne readout in a science configuration, thereby validating the experimental approach that will be used in the upgraded ALPS II run. The null result itself provides an initial, albeit modest, constraint on axion-like particle parameter space that is inaccessible to accelerator experiments.

major comments (1)
  1. The central sensitivity claim of a few 10^{-13} is load-bearing for the paper’s primary result. The manuscript must supply measured values for cavity finesse, heterodyne efficiency, power calibration factors, and a quantitative systematic uncertainty budget (including residual laser leakage, misalignment, and magnetic-field integral uncertainties) so that the conversion-probability limit can be independently verified from the reported data.
minor comments (2)
  1. Clarify the exact definition of the quoted sensitivity (e.g., 95 % CL upper limit on conversion probability) and state whether it is averaged over the two polarization configurations or reported separately.
  2. Include a brief table or plot showing the observed power after the wall versus expected noise-only distribution to illustrate the background subtraction.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading and constructive feedback on our manuscript describing the first science campaign of ALPS II. The suggestion to strengthen the documentation of the sensitivity calculation is well taken, and we have revised the paper to address this point directly.

read point-by-point responses

  1. Referee: The central sensitivity claim of a few 10^{-13} is load-bearing for the paper’s primary result. The manuscript must supply measured values for cavity finesse, heterodyne efficiency, power calibration factors, and a quantitative systematic uncertainty budget (including residual laser leakage, misalignment, and magnetic-field integral uncertainties) so that the conversion-probability limit can be independently verified from the reported data.

    Authors: We agree that a transparent and verifiable presentation of the sensitivity is essential for the primary result. In the revised manuscript we have added Section 5.2, which reports the measured cavity finesse of 1.15(6)×10^4 obtained from ring-down measurements, the heterodyne detection efficiency of 0.79(4) determined via calibrated power injection, and the power calibration chain with its associated factors and uncertainties. A new Table 4 provides the full systematic uncertainty budget, including an upper limit on residual laser leakage of < 3×10^{-15}, a 4% contribution from misalignment, and a 2% uncertainty on the magnetic-field integral. These additions allow the quoted conversion-probability sensitivity of a few 10^{-13} to be reconstructed and verified from the published data. revision: yes

Circularity Check

0 steps flagged

No circularity: direct experimental null result with external calibration chain

full rationale

The paper is a straightforward experimental report of a light-shining-through-a-wall search. It describes the ALPS II apparatus, the two polarization runs, the heterodyne detection, and the cavity enhancement, then states the observed outcome (no excess power) and the resulting conversion-probability sensitivity of a few 10^{-13}. No derivation, ansatz, or uniqueness theorem is invoked that reduces by construction to a fitted parameter defined from the same data set. The sensitivity figure is obtained from measured power, known magnet integrals, and cavity build-up factors; these are independent experimental inputs, not self-referential. Self-citations to prior ALPS work, if present, are not load-bearing for the central null-result claim. The analysis therefore remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The central claim rests on standard assumptions of particle-physics detector calibration and background modeling that are not enumerated in the abstract.

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Forward citations

Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Any Light Particle Searches with ALPS II: first science results

    hep-ex 2025-12 unverdicted novelty 7.0

    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.

  2. Characterization of a Two-Channel Optical and Near-infrared Transition Edge Sensor System for Rare-Event Searches

    physics.ins-det 2026-05 unverdicted novelty 4.0

    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.

Reference graph

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    Changes in Open Shutter Data Scatter plots showing the changes between open shutter periods are shown in Fig- ure 22. From the plots in 22a and 22c it is apparent that the absolute value of the changes between the magnitude squared of two points in the open shutter calibration series |Copen,j |2 − |Copen,j−1 |2 increased as the time between the pointsj−1 ...

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  44. [44]

    Signal Leakage Irregular gaps in the closed shutter data exist due to the need for open shutter and mainte- nance periods, as well as the system coming un- locked during the closed shutter periods. These gaps lead to signals at a given frequency leaking into neighboring frequency bins as the integra- tion of the product a static constant with these neighb...

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  45. [45]

    Double Checking the Calibration Three alternative versions ofC[n] were ap- plied to the data to investigate different effects in the calibration array. For the first alterna- tive series, the mean value of the calibration se- ries, or⟨C[n]⟩was calculated over the full run, the coherent sum was performed independently, and⟨C[n]⟩was used to calibrate the re...

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