Axion-mediated dark matter and Higgs diphoton signal

A bstract We consider axion-mediated dark matter models motivated by Fermi gamma ray line at 130 GeV, where an axion-like scalar couples to a singlet Dirac fermion dark matter (DM) so its anomaly interactions with electroweak gauge bosons allow the DM to annihilate into monochromatic photon(s). In t...

Full description

Saved in:
Bibliographic Details
Published in:The journal of high energy physics 2012-12, Vol.2012 (12), Article 37
Main Authors: Lee, Hyun Min, Park, Myeonghun, Park, Wan-II
Format: Article
Language:English
Subjects:
Bosons
Classical and Quantum Gravitation
Couplings
Dark matter
Elementary Particles
Fermions
Gamma rays
Higgs bosons
High energy physics
Leptons
Photons
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Relativity Theory
String Theory
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 axion-mediated dark matter models motivated by Fermi gamma ray line at 130 GeV, where an axion-like scalar couples to a singlet Dirac fermion dark matter (DM) so its anomaly interactions with electroweak gauge bosons allow the DM to annihilate into monochromatic photon(s). In these models, extra vector-like leptons generate the necessary anomaly interactions for the axion and can also modify the Higgs-to-diphoton rate by their Yukawa couplings to the SM Higgs boson. We can distinguish models by the branching fraction of the DM annihilation into a photon pair, favoring the model with a triplet fermion. From the condition that the lighter charged extra lepton must be heavier than dark matter for no tree-level DM annihilations, we also show that the ratio of Higgs-to-diphoton rate to the SM value is constrained by vacuum stability to 1.4 (1.5) for the cutoff scale of 10 (1) TeV.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP12(2012)037