Electroweak baryogenesis from a dark sector

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Cline , J M , Kainulainen , K & Tucker-Smith , D 2017 , ' Electroweak baryogenesis from a dark sector ' , Physical Review D , vol. 95 , no. 11 , 115006 . https://doi.org/10.1103/PhysRevD.95.115006

Title: Electroweak baryogenesis from a dark sector
Author: Cline, James M.; Kainulainen, Kimmo; Tucker-Smith, David
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2017-06-07
Language: eng
Number of pages: 16
Belongs to series: Physical Review D
ISSN: 2470-0010
URI: http://hdl.handle.net/10138/209580
Abstract: 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.
114 Physical sciences

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