Abstract
We study a scalar singlet dark matter (DM) having mass in sub-TeV regime by extending the minimal scalar singlet DM setup by additional vector like fermions. While the minimal scalar singlet DM satisfies the relic and direct detection constraints for mass beyond TeV only, presence of its portal coupling with vector like fermions opens up additional co-annihilation channels. These vector like fermions also help in achieving electroweak vacuum stability all the way up to Planck scale. We find that for one generation of vector like quarks consisting of a $SU(2)_L$ doublet and a singlet, scalar singlet DM with mass a few hundred GeV can indeed satisfy relic, direct detection and other relevant constraints while also making the electroweak vacuum absolutely stable. The same can be achieved by introducing vector like leptons too, but with three generations. While the model with vector like quarks is minimal, the three generations of vector like lepton doublet and neutral singlet can also give rise to light neutrino mass at one loop level.
Highlights
Understanding the nature of the dark matter (DM) remains an outstanding problem of present day particle physics
We find that at least three such generations of leptons are required to achieve absolute electroweak vacuum stability with the help of DM-Higgs portal coupling where a sub-TeV scalar singlet DM becomes allowed from all phenomenological constraints
Since we look for reopening the window of scalar singlet DM in the intermediate mass range ∼ð200–950Þ GeV through the coannihilation process with the vectorlike quarks (VLQs), we expect these VLQs to be heavier but having mass close to DM mass
Summary
Understanding the nature of the dark matter (DM) remains an outstanding problem of present day particle physics. We find that at least three such generations of leptons are required to achieve absolute electroweak vacuum stability with the help of DM-Higgs portal coupling (to some extent) where a sub-TeV scalar singlet DM becomes allowed from all phenomenological constraints. While this scenario requires more additional fermions compared to the VLQ model, the additional leptons can take part in generating light neutrino mass at one loop level. Appendices A and B are provided to summarize the beta functions of the model parameters
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