Global fits of axion-like particles to XENON1T and astrophysical data

Peter Athron, Csaba Balázs, Ankit Beniwal, J. Eliel Camargo-Molina, Andrew Fowlie*, Tomás E. Gonzalo, Sebastian Hoof, Felix Kahlhoefer, David J.E. Marsh, Markus Tobias Prim, Andre Scaffidi, Pat Scott, Wei Su, Martin White, Lei Wu, Yang Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


The excess of electron recoil events seen by the XENON1T experiment has been interpreted as a potential signal of axion-like particles (ALPs), either produced in the Sun, or constituting part of the dark matter halo of the Milky Way. It has also been explained as a consequence of trace amounts of tritium in the experiment. We consider the evidence for the solar and dark-matter ALP hypotheses from the combination of XENON1T data and multiple astrophysical probes, including horizontal branch stars, red giants, and white dwarfs. We briefly address the influence of ALP decays and supernova cooling. While the different datasets are in clear tension for the case of solar ALPs, all measurements can be simultaneously accommodated for the case of a sub-dominant fraction of dark-matter ALPs. Nevertheless, this solution requires the tuning of several a priori unknown parameters, such that for our choices of priors a Bayesian analysis shows no strong preference for the ALP interpretation of the XENON1T excess over the background hypothesis.

Original languageEnglish
Article number159
JournalJournal of High Energy Physics
Issue number5
Publication statusPublished - May 2021
Externally publishedYes


  • Beyond Standard Model
  • Cosmology of Theories beyond the SM


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