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RESEARCH PRODUCT
Electroweak baryogenesis from a dark sector
Kimmo KainulainenDavid Tucker-smithJames M. Clinesubject
Astrophysics and AstronomyParticle physicsCosmology and Nongalactic Astrophysics (astro-ph.CO)standard model of particle physicsPhysics beyond the Standard ModelSTANDARD MODELFOS: Physical sciences01 natural sciences7. Clean energy114 Physical sciencesdark matterHiggs sectorStandard Modelpimeä aineHigh Energy Physics - Phenomenology (hep-ph)Baryon asymmetry0103 physical sciencesSINGLET010306 general physicsParticle Physics - PhenomenologyPhysicsta114010308 nuclear & particles physicsElectroweak interactionHigh Energy Physics::Phenomenologyhiukkasfysiikan standardimalliRADIATIVE NEUTRINO MASShep-phSphaleronBaryogenesisHigh Energy Physics - Phenomenologyastro-ph.COHiggs bosonPHASE-TRANSITIONHigh Energy Physics::ExperimentMATTERAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
Adding an extra singlet scalar $S$ to the Higgs sector can provide a barrier at tree level between a false vacuum with restored electroweak symmetry and the true one. This has been demonstrated to readily give a strong phase transition as required for electroweak baryogenesis. We show that with the addition of a fermionic dark matter particle $\chi$ coupling to $S$, a simple UV-complete model can realize successful electroweak baryogenesis. The dark matter gets a CP asymmetry that is transferred to the standard model through a $CP\ portal\ interaction$, which we take to be a coupling of $\chi$ to $\tau$ leptons and an inert Higgs doublet. The CP asymmetry induced in left-handed $\tau$ leptons biases sphalerons to produce the baryon asymmetry. The model has promising discovery potential at the LHC, while robustly providing a large enough baryon asymmetry and correct dark matter relic density with reasonable values of the couplings.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-02-28 |