6533b828fe1ef96bd1288543
RESEARCH PRODUCT
A class of invisible axion models with FCNCs at tree level
Hugo SerôdioJavier Fuentes-martínAlejandro Celissubject
PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsCabibbo–Kobayashi–Maskawa matrixScalar (mathematics)High Energy Physics::PhenomenologyFOS: Physical sciences01 natural sciencesSymmetry (physics)Standard ModelDomain wall (string theory)High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)0103 physical sciencesStrong CP problem010306 general physicsAxionBosondescription
We build a class of invisible axion models with tree-level Flavor Changing Neutral Currents completely controlled by the fermion mixing matrices. The scalar sector of these models contains three-Higgs doublets and a complex scalar gauge singlet, with the same fermionic content than the Standard Model. A horizontal Peccei-Quinn symmetry provides a solution to the strong CP problem and predicts the existence of a very light and weakly coupled pseudo-Goldstone boson, the invisible axion or familon. A phenomenological analysis is performed taking into account familon searches in rare kaon and muon decays, astrophysical considerations and axion searches via axion-photon conversion. Drastic differences are found in the axion properties of different models due to the strong hierarchy of the CKM matrix, making some of the models considered much more constrained than others. We also obtain that a rich variety of these models avoid the domain wall problem. A possible mechanism to protect the solution to the strong CP problem against gravitational effects is also discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-12-29 |