Flavoured warped axion

A bstract We consider a 5D extension of the DFSZ axion model that addresses both the axion quality and fermion mass hierarchy problems, and predicts flavour-dependent, off-diagonal axion-fermion couplings. The axion is part of a 5D complex scalar field charged under a U(1) PQ symmetry that is sponta...

Full description

Saved in:
Bibliographic Details
Published in:The journal of high energy physics 2021-04, Vol.2021 (4), p.1-38, Article 84
Main Authors: Bonnefoy, Quentin, Cox, Peter, Dudas, Emilian, Gherghetta, Tony, Nguyen, Minh D.
Format: Article
Language:English
Subjects:
Beyond Standard Model
Classical and Quantum Gravitation
Couplings
CP violation
Elementary Particles
Fermions
Field Theories in Higher Dimensions
Flavor (particle physics)
Global Symmetries
High energy physics
Leptons
Physics
Physics and Astronomy
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Regular Article - Theoretical Physics
Relativity Theory
Scalars
Standard model (particle physics)
String Theory
Symmetry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A bstract We consider a 5D extension of the DFSZ axion model that addresses both the axion quality and fermion mass hierarchy problems, and predicts flavour-dependent, off-diagonal axion-fermion couplings. The axion is part of a 5D complex scalar field charged under a U(1) PQ symmetry that is spontaneously broken in the bulk, and is insensitive to explicit PQ breaking on the UV boundary. Bulk Standard Model fermions interact with two Higgs doublets that can be localized on the UV boundary or propagate in the bulk to explain the fermion masses and mixings. When the Higgs doublets are localized on the UV boundary, they induce flavour diagonal couplings between the fermions and the axion. However, when the Higgs doublets propagate in the bulk, the overlap of the axion and fermion profiles generates flavour off-diagonal couplings. The effective scale of these off-diagonal couplings in both the quark and lepton sectors can be as small as 10 11 GeV, and therefore will be probed in future precision flavour experiments.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP04(2021)084