Abstract
We investigate a dark matter model involving an inert $\mathrm{SU}(2)_\mathrm{L}$ quadruplet scalar with hypercharge 1/2. After the electroweak symmetry breaking, the dark sector contains one doubly charged, two singly charged, and two neutral scalars. The lighter neutral scalar can be a viable dark matter candidate. Electroweak production of these scalars at the Large Hadron Collider leads to potential signals in the $\text{monojet} + /\!\!\!\!E_\mathrm{T}$ and $\text{soft-leptons} + \text{jets} + /\!\!\!\!E_\mathrm{T}$ channels. We thus derive constraints on the model by reinterpreting recent experimental searches. Based on simulation, we further evaluate the sensitivity at a future 100 TeV $pp$ collider.
Highlights
Among various candidates of particle dark matter (DM), weakly interacting massive particles (WIMPs) seem rather appealing, because they could naturally predict a thermal relic abundance consistent with the observed value [1,2,3]
We demonstrate the green regions excluded by the ATLAS monojet search, which has been discussed in the previous section
For λ2 > 0, the lighter neutral scalar φ plays the role of DM particle
Summary
Among various candidates of particle dark matter (DM), weakly interacting massive particles (WIMPs) seem rather appealing, because they could naturally predict a thermal relic abundance consistent with the observed value [1,2,3]. We concentrate on production signals of the new scalar bosons in the model at the Large Hadron Collider (LHC) and future pp colliders, which have not been studied in the previous literature. At the LHC energies, electroweak production rates for the dark sector scalars are quite low, and, the constraints from current LHC searches are still weak.
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