Catalysis of Electroweak Baryogenesis via Fermionic Higgs Portal Dark Matter
Catalysis of Electroweak Baryogenesis via Fermionic Higgs Portal Dark Matter
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发表时间：
2015-02
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通讯作者：
W. Chao;M. Ramsey-Musolf
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作者：
W. Chao;M. Ramsey-Musolf
我们使用由类矢量费米子增强的两个希格斯双峰模型研究费米子希格斯门暗物质对电弱重子生成的催化作用。在存在稳定对称性 Z_2 或规范的 U(1)_D 对称性的情况下，最轻的中性费米子质量本征态提供了可行的暗物质候选者。允许在最低维度希格斯粒子门户暗物质相互作用中存在不消失的 CP 破坏相，从而可以生成观察到的暗物质遗迹密度，同时避开直接检测范围。同一相为电弱重子生成提供了来源。我们表明，通过电偶极矩（EDM）搜索和直接探测实验，可以获得观测到的可见物质和暗物质的丰度，同时满足当前的界限。将目前的电子（中子）EDM 灵敏度提高一（两个）数量级将为这种情况提供结论性的测试。
We investigate catalysis of electroweak baryogenesis by fermionic Higgs portal dark matter using a two Higgs doublet model augmented by vector-like fermions. The lightest neutral fermion mass eigenstate provides a viable dark matter candidate in the presence of a stabilizing symmetry Z_2 or gauged U(1)_D symmetry. Allowing for a non-vanishing CP-violating phase in the lowest-dimension Higgs portal dark matter interactions allows generation of the observed dark matter relic density while evading direct detection bounds. The same phase provides a source for electroweak baryogenesis. We show that it is possible to obtain the observed abundances of visible and dark matter while satisfying present bounds from electric dipole moment (EDM) searches and direct detection experiments. Improving the present electron (neutron) EDM sensitivity by one (two) orders of magnitude would provide a conclusive test of this scenario.