Abstract
We examine the sensitivity at a future 100 TeV proton-proton collider to compressed dark sectors whose decay products are invisible due to below-threshold energies and/or small couplings to the Standard Model. Such a scenario could be relevant to models of WIMP dark matter, where the lightest New Physics state is an (isolated) electroweak multiplet whose lowest component is stable on collider timescales. We rely on the additional emission of a hard on-shell Z-boson decaying to leptons, a channel with low background systematics, and include a careful estimate of the real and fake backgrounds to this process in our analysis. We show that an integrated luminosity of 30 ab−1 would allow exclusion of a TeV-scale compressed dark sector with inclusive production cross section 0.3 fb, for 1% background systematic uncertainty and splittings below 5 GeV. This translates to exclusion of a pure higgsino (wino) multiplet with mass of 500 (970) GeV.
Highlights
Invisible states, followed by the mono-photon channel, with a far reduced sensitivity achievable in leptonic mono-Z
Such a scenario could be relevant to models of WIMP dark matter, where the lightest New Physics state is an electroweak multiplet whose lowest component is stable on collider timescales
We show that an integrated luminosity of 30 ab−1 would allow exclusion of a TeV-scale compressed dark sector with inclusive production cross section 0.3 fb, for 1% background systematic uncertainty and splittings below 5 GeV
Summary
After electroweak symmetry breaking the mass mixing with the singlet splits the neutral Dirac fermion into two Majorana fermions χ01 and chi; for large mS the mass splitting between these two states, ∆0 = chi02 − χ01 is too small to give rise to detectable decay products: 10 TeV ∆0 ∼ 200 MeV mS. By contrast the sensitivity has a weak dependence on ∆+, through the cut efficiencies, and only for ∆+ above a certain threshold, beyond which the visible decay products have enough energy to fall foul of our object vetos.3 This threshold, which we see is around a 5-GeV splitting, ours is a one-parameter analysis which is completely insensitive to the details of the decays. This ranges from 1 fb for a 400-GeV χ to 0.05 fb at 1.2 TeV
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