Constraining axion-like particles from rare pion decays

10 Oct 2020 Altmannshofer Wolfgang Gori Stefania Robinson Dean J.

Ultraviolet completions for axion-like 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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  • HIGH ENERGY PHYSICS - PHENOMENOLOGY