Singlet fermionic dark matter with dark Z
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)$$_X$$ X gauge symmetry, and introduce an additional scalar electroweak doublet field with the U(1)$$_X$$ X charge as a mediator. The h...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2020-06-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-020-8080-x |
| Summary: | 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)$$_X$$ X gauge symmetry, and introduce an additional scalar electroweak doublet field with the U(1)$$_X$$ X charge as a mediator. The hidden U(1)$$_X$$ 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)$$_X$$ 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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| ISSN: | 1434-6044 1434-6052 |