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Open Access Publications from the University of California

Constraining axionlike particles from rare pion decays

  • Author(s): Altmannshofer, W
  • Gori, S
  • Robinson, DJ
  • et al.

© 2020 authors. Published by the American Physical Society. Ultraviolet completions for axionlike particles (ALPs) lighter than the neutral pion generically induce ALP-neutral pion mixing and are therefore sensitive to direct constraints on the mixing angle. For ALPs below the pion mass, we demonstrate that strong and novel bounds on the ALP-pion mixing angle can be extracted from existing rare pion decay data, measured by the PIENU and PIBETA experiments.

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