LHC constraints on electroweakino dark matter revisited

Abstract

We revisit LHC searches for heavy invisible particles by exploiting QCD initial state radiation. We recast a dijet signal region in a general multijet plus MET search by ATLAS. We find that non-trivial mass limit can be obtained for various models of the electroweakino sector with the present data in hadronic channels. The winos are bound to be heavier than $m_{\tilde{W}}\gtrsim 160$ GeV and higgsinos $m_{\tilde{h}}\gtrsim 100$ GeV, depending on the chargino-neutralino mass splitting. The expected exclusion limits at the LHC Run 3 with $\mathcal{L}=300$ fb${}^{-1}$ increase to $m_{\tilde{W}}\gtrsim 200$ GeV and $m_{\tilde{h}}\gtrsim 130$ GeV for winos and higgsino, respectively. This is the first LHC limit for promptly decaying nearly mass-degenerate winos.

8 pages, 5 figures; updated references, expectations for LHC Run 3 added; to appear in PRD

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Cited by in corpus (5)

• Seeking a coherent explanation of LHC excesses for compressed spectra
• Taking aim at the wino-higgsino plane with the LHC
• A joint explanation for the soft lepton and monojet LHC excesses in the wino-bino model
• Deciphering compressed electroweakino excesses with MadAnalysis 5
• Machine Learning Electroweakino Production