Abstract
We explore the possibility of having a fermionic dark matter candidate within U(1)′ models for CEνNS experiments in light of the latest COHERENT data and the current and future dark matter direct detection experiments. A vector-like fermionic dark matter has been introduced which is charged under U(1)′ symmetry, naturally stable after spontaneous symmetry breaking. We perform a complementary investigation using CEνNS experiments and dark matter direct detection searches to explore dark matter as well as Z′ boson parameter space. Depending on numerous other constraints arising from the beam dump, LHCb, BABAR, and the forthcoming reactor experiment proposed by the SBC collaboration, we explore the allowed region of Z′ portal dark matter.
Highlights
JHEP09(2021)146 particular, there exists some interesting light mediators models connecting dark photons with the light dark matter, as pointed in [27,28,29,30,31,32,33]
We explore the possibility of having a fermionic dark matter candidate within U(1) models for CEνNS experiments in light of the latest COHERENT data and the current and future dark matter direct detection experiments
Depending on numerous other constraints arising from the beam dump, LHCb, BABAR, and the forthcoming reactor experiment proposed by the Scintillating Bubble Chamber (SBC) collaboration, we explore the allowed region of Z portal dark matter
Summary
The coherent elastic neutrino-nucleus scattering (CEνNS) was measured by the COHERENT experiment [1] using neutrinos from a stopped-pion source at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. For DM masses below O(10) GeV the direct detection bounds are much less stringent, due to poor detector sensitivity to nuclear recoils induced by the light dark matter. For the light dark matter and light Z , the correct relic density is obtained for gauge couplings of order 0.1 − 1, which are excluded by CEνNS experiments. This motivates the use of an annihilation cross-section enhancement mechanism. For the different models we will need different singlet scalar fields φi transforming as i under the U(1) , as shown, in order to obtain phenomenologically viable neutrino mass matrices through the type-I seesaw mechanism. Masses of Z (MZ2 ) g 2(4v22) g 2(v12 + 4v22) g 2(v12 + 4v22 + 16v42) g 2(9v32 + 36v62)
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