Constraining axionlike particles from rare pion decays
Wolfgang Altmannshofer, Stefania Gori, Dean J. Robinson
Abstract
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.
Topics & Concepts
Particle physicsPhysicsPionNuclear physicsRare eventsStatisticsMathematicsParticle physics theoretical and experimental studiesDark Matter and Cosmic PhenomenaQuantum Chromodynamics and Particle Interactions