Abstract
The Weakly Interacting Massive Particle (WIMP) paradigm is one of the most compelling scenarios for particle dark matter (DM). We show in this paper that a high energy muon collider can make decisive statements about the WIMP DM, and this should serve as one of its main physics driver cases. We demonstrate this by employing the DM as the lightest member of an electroweak (EW) multiplet, which is a simple, yet one of the most challenging WIMP scenarios given its minimal collider signature and high thermal target mass scale of 1 TeV$-$23 TeV. We perform a first study of the reach of high energy muon colliders, focusing on the simple, inclusive and conservative signals with large missing mass, through the mono-photon, VBF di-muon and a novel mono-muon channel. Using these inclusive signals, it is possible to cover the thermal targets of doublet and triplet with a 10 TeV muon collider. Higher energies, 14 TeV$-$75 TeV, would ensure a $5 \sigma$ reach above the thermal targets for the higher EW multiplets. We also estimate the reach of a search for disappearing tracks, demonstrating the potential significant enhancement of the sensitivity.
Highlights
There is mounting evidence for the existence of dark matter (DM) from the astronomical and cosmological observations [1,2]
Among the weakly interacting massive particle (WIMP) candidates, one simple case is the dark matter particle being the lightest member of an electroweak (EW) multiplet
The mass scale set by the requirement of saturating the thermal relic abundance is in the range of 1–23 TeV, while lower masses can still be viable with nonthermal production mechanisms
Summary
There is mounting evidence for the existence of dark matter (DM) from the astronomical and cosmological observations [1,2]. It is generic to expect that the masses of the members of the same multiplet are highly degenerate Both the high mass scale and near degeneracy render the DM searches at colliders extremely challenging. We follow the basic assumption that the integrated luminosity of high energy colliders scales linearly with s Motivated by this exciting perspective, we perform a first study on the reach of muon colliders for WIMP DM. It would either decay into slow-moving (soft) particles or leaving (disappearing) charged tracks in the detector These signals will certainly be an integral part of the DM searches at a muon collider. We find that the future high energy muon collider can draw firm conclusions on the EW multiplet WIMP DM by a combination of the multiple search channels considered in this paper. We provide the details of our results for the 2σ and 5σ sensitivities for the EW multiplets with various machine parameter choices in an appendix
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