Precision axion physics with running axion couplings

• Main Authors: Kiwoon Choi, Sang Hui Im, Hee Jung Kim, Hyeonseok Seong
• Format: Article
• Language: English
• Published: SpringerOpen 2021-08-01
• Series: Journal of High Energy Physics
• Subjects: Beyond Standard Model; Effective Field Theories; Renormalization Group; Compactification and String Models
• Online Access: https://doi.org/10.1007/JHEP08(2021)058

Abstract We study the renormalization group running of axion couplings while taking into account that the Standard Model can be extended to its supersymmetric extension at a certain energy scale below the axion decay constant. We then apply our results to three different classes of axion models, i.e. KSVZ-like, DFSZ-like, and string-theoretic axions, and examine if string-theoretic axions can be distinguished from others by having a different pattern of low energy couplings to the photon, nucleons and electron. We find that the low energy couplings of string-theoretic axions have a similar pattern as those of KSVZ-like axions but yet reveal a sizable difference which might be testable in future axion search experiments. We also note that the coupling of KSVZ-like QCD axions to the electron is dominated by a three-loop contribution involving the exotic heavy quark, gluons, top quark and Higgs field.