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arXiv · 2002.10075

Singlet Fermionic Dark Matter with Dark $Z$

Dong-Won Jung·Soo-hyeon Nam·Chaehyun Yu·Yeong Gyun Kim·Kang Young Lee
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Abstract

We present a fermionic dark matter model mediated by the hidden gauge boson. We assume the QED-like hidden sector which consists of a Dirac fermion and U(1)$_X$ gauge symmetry, and introduce an additional scalar electroweak doublet field with the U(1)$_X$ charge as a mediator. The hidden U(1)$_X$ symmetry is spontaneously broken by the electroweak symmetry breaking and there exists a massive extra neutral gauge boson in this model which is the mediator between the hidden and visible sectors. Due to the U(1)$_X$ charge, the additional scalar doublet does not couple to the Standard Model fermions, which leads to the Higgs sector of type I two Higgs doublet model. The new gauge boson couples to the Standard Model fermions with couplings proportional to those of the ordinary $Z$ boson but very suppressed, thus we call it the dark $Z$ boson. We study the phenomenology of the dark $Z$ boson and the Higgs sector, and show the hidden fermion can be the dark matter candidate.

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Dong-Won Jung, Soo-hyeon Nam, Chaehyun Yu, Yeong Gyun Kim, Kang Young Lee. 2020-02-24. Singlet Fermionic Dark Matter with Dark $Z$. https://doi.org/10.1140/epjc/s10052-020-8080-x

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