TL;DR
This paper investigates mono-lepton plus missing energy signals at the LHC to constrain dark matter interactions with quarks, revealing that current mono-lepton searches provide strong bounds, especially for axial vector and isospin-violating couplings.
Contribution
It demonstrates the significance of mono-lepton signatures in constraining dark matter-quark interactions and derives limits from existing W' searches, highlighting interference effects and potential for coupling disentanglement.
Findings
Mono-leptons set strong bounds on dark matter interactions.
Interference effects influence the limits on quark couplings.
Mono-leptons can distinguish dark matter couplings to up- and down-type quarks.
Abstract
We explore the implications of the mono-lepton plus missing transverse energy signature at the LHC, and point out its significance on understanding how dark matter interacts with quarks, where the signature arises from dark matter pair production together with a leptonically decaying W boson radiated from the initial state quarks. We derive limits using the existing W' searches at the LHC, and find an interesting interference between the contributions from dark matter couplings to up-type and down-type quarks. Mono-leptons can actually furnish the strongest current bound on dark matter interactions for axial vector (spin-dependent) interactions and iso-spin violating couplings. Should a signal of dark matter production be observed, this process can also help disentangle the dark matter couplings to up- and down-type quarks.
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