Constraining axion-like particles from rare pion decays

Abstract

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.

7 pages, 4 figures, published version

References in corpus (6)

• Physics Beyond Colliders at CERN: Beyond the Standard Model Working Group Report
• Collider Probes of Axion-Like Particles
• Revised constraints and Belle II sensitivity for visible and invisible axion-like particles
• Photoproduction of axion-like particles
• Search for Production of Invisible Final States in Single-Photon Decays of Upsilon(1S)
• Search for Heavy Neutrinos in $\pi \to \mu \nu$ Decay

Cited by in corpus (21)

• Flavor probes of axion-like particles
• The High Quality QCD Axion and the LHC
• Heavy Axion Opportunities at the DUNE Near Detector
• Heavy QCD Axion in $b\to s$ transition: Enhanced Limits and Projections
• Heavy QCD Axion at Belle II: Displaced and Prompt Signals
• Testing Lepton Flavor Universality with Pion, Kaon, Tau, and Beta Decays
• Axion-like Particle Searches at DarkQuest
• New Opportunities for Detecting Axion-Lepton Interactions
• Solutions to the MiniBooNE Anomaly from New Physics in Charged Meson Decays
• Search for three body pion decays ${\pi }^{+}\to l^{+}\nu X$
• Improved Standard-Model prediction for ${\pi }^0\to e^{+}{e}^{-}$
• Neutron Interferometry and axion like particles
• Exploring new possibilities to discover a light pseudo-scalar at LHCb
• New Laboratory Constraints on Neutrinophilic Mediators
• Axion-like particles resolve the $B\to \pi K$ and g-2 anomalies
• Three Exceptions to the Grossman-Nir Bound
• ALP-Pions generalized
• Type-II Majoron Dark Matter
• A comprehensive study of ALPs from $B$-decays
• Searching for axions with kaon decay at rest
• Probing leptophobic dark sector with a pseudoscalar portal in the NA64 experiment at CERN