Abstract
We consider minimal dark matter scenarios featuring momentum-dependent couplings of the dark sector to the Standard Model. We derive constraints from existing LHC searches in the monojet channel, estimate the future LHC sensitivity for an integrated luminosity of 300 fb−1, and compare with models exhibiting conventional momentum-independent interactions with the dark sector. In addition to being well motivated by (composite) pseudo-Goldstone dark matter scenarios, momentum-dependent couplings are interesting as they weaken direct detection constraints. For a specific dark matter mass, the LHC turns out to be sensitive to smaller signal cross-sections in the momentum-dependent case, by virtue of the harder jet transverse-momentum distribution.
Highlights
Subsequently generates additional non-derivative momentum-independent couplings proportional to /f
Dedicated LHC searches could detect such additional states, we consider a simple setup where the only new states that are accessible at the LHC are the dark matter particle and the mediator connecting the Standard Model and the dark sector
We first consider an invisible sector solely comprised of a Standard Model-singlet real scalar field η which is taken to be odd under a Z2 discrete symmetry
Summary
In order to study the impact of derivative and non-derivative couplings of dark matter to the Standard Model, we first consider a minimal setup involving both momentum-dependent and momentum-independent couplings of the dark matter particle. The monojet signal arises from off-shell Higgs-boson production, and the derivative interactions of the η particle result in a strong momentum dependence at the differential cross-section level. The subsequent differences in the jet transverse momentum distribution could allow us to discriminate derivative from non-derivative dark matter couplings This comes at the price of a suppression of the monojet signal, since the relevant partonic cross-section σdepends on the virtuality of the Higgs boson p2h as σ(gg. The precise determination of the Higgs-boson mass and the important LHC constraints on its production cross-section and decay width result in tight bounds on the free parameters of the model, mη mh/2, λ 1, f 500 GeV − 1 TeV ,.
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