Novel Higgsino dark matter signal interpretation at the LHC

In the LHC searches for gluinos it is usually assumed that they decay predominantly into the lightest neutralino plus jets. In this work we perform a proof-of-concept collider analysis of a novel supersymmetric signal in which gluinos decay mostly into jets and the bino-like neutralino ((chi) over cap (0)(3)), which in turn decays into the lightest Higgsino-like neutralino ((chi) over cap (0)(1)), considered the dark matter candidate, together with the SM-like Higgs boson (h). This new physics signal then consists of an LHC final state made up by four light jets, four b-jets, and a large amount of missing transverse energy. We identify (tt) over bar, V + jets (V = W, Z), and (tt) over bar + (X = W ,Z, gamma*, h) productions as the most problematic backgrounds, and develop a search strategy for the high luminosity phase of the LHC, reaching signal significances at the evidence level for a luminosity of 1000 fb(-1). The prospects for a luminosity of 3000 fb(-1) are even more promising, with discovery-level significances.

Automated summary

In this study, a novel supersymmetric signal with gluinos decaying into jets and bino-like neutralino is analyzed at the LHC. The signal involves four light jets, four b-jets, and a significant amount of missing transverse energy. Backgrounds such as top quark pairs, V + jets, and top quark pairs with additional electroweak boson productions are identified as challenging, but prospects for discovery at high luminosity phases of the LHC are promising.