Electroweak baryogenesis from a dark sector
Electroweak baryogenesis from a dark sector
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DOI：
10.1103/physrevd.95.115006
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发表时间：
2017-02
影响因子：
5
通讯作者：
J. Cline;K. Kainulainen;David Tucker-Smith
中科院分区：
文献类型：
--
作者：
J. Cline;K. Kainulainen;David Tucker-Smith
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.
