Minimal Flavor Violation with Axion-like Particles

Abstract

We revisit the flavor-changing processes involving an axion-like particle (ALP) in the context of generic ALP effective lagrangian with a discussion of possible UV completions providing the origin of the relevant bare ALP couplings. We focus on the minimal scenario that ALP has flavor-conserving couplings at tree level, and the leading flavor-changing couplings arise from the loops involving the Yukawa couplings of the Standard Model fermions. We note that such radiatively generated flavor-changing ALP couplings can be easily suppressed in field theoretic ALP models with sensible UV completion. We discuss also the implication of our result for string theoretic ALP originating from higher-dimensional $p$-form gauge fields, for instance for ALP in large volume string compactification scenario.

41 pages, 3 figures; v3: a discussion on general extended Higgs sector added in sec. 2, version published in JHEP

References in corpus (2)

• Flaxion: a minimal extension to solve puzzles in the standard model
• A New Flavor of Searches for Axion-Like Particles

Cited by in corpus (7)

• Revised constraints and Belle II sensitivity for visible and invisible axion-like particles
• Thermal QCD Axions across Thresholds
• Precision axion physics with running axion couplings
• Searching for axionlike particle at future $ep$ colliders
• Unitarity constraints on ALP interactions
• High-quality axions in solutions to the $\mu$ problem
• Flavor-Violating Higgs Decays and Stellar Cooling Anomalies in Axion Models