The case for 100 GeV bino dark matter: A dedicated LHC tri-lepton search

Abstract

Global fit studies performed in the pMSSM and the photon excess signal originating from the Galactic Center seem to suggest compressed electroweak supersymmetric spectra with a $\sim$100 GeV bino-like dark matter particle. We find that these scenarios are not probed by traditional electroweak supersymmetry searches at the LHC. We propose to extend the ATLAS and CMS electroweak supersymmetry searches with an improved strategy for bino-like dark matter, focusing on chargino plus next-to-lightest neutralino production, with a subsequent decay into a tri-lepton final state. We explore the sensitivity for pMSSM scenarios with $\Delta m=m_{\mathrm{NLSP}}-m_{\mathrm{LSP}}\sim (5-50)$ GeV in the $\sqrt{s}=14$ TeV run of the LHC. Counterintuitively, we find that the requirement of low missing transverse energy increases the sensitivity compared to the current ATLAS and CMS searches. With 300 fb${}^{-1}$ of data we expect the LHC experiments to be able to discover these supersymmetric spectra with mass gaps down to $\Delta m\sim 9$ GeV for DM masses between 40 and 140 GeV. We stress the importance of a dedicated search strategy that targets precisely these favored pMSSM spectra.

Published in JHEP

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• Searching for Singlino-Higgsino Dark Matter in the NMSSM
• The current status of fine-tuning in supersymmetry
• Impact of QCD uncertainties on antiproton spectra from dark-matter annihilation
• Probing mild-tempered neutralino dark matter through top-squark production at the LHC
• The 750 GeV diphoton excess and SUSY
• Non-Standard Neutrino Spectra From Annihilating Neutralino Dark Matter
• Dark matter properties implied by gamma ray interstellar emission models