Probing light bino and higgsinos at the LHC

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Motivated by the naturalness, we study a simplified MSSM scenario where only the bino-like LSP and higgsino-like NLSP are light. We first scan the parameter space of this scenario, considering the constraints from the Higgs mass, flavor physics, electroweak precision measurements and dark matter experiments. Then in the allowed parameter space, we perform a Monte Carlo simulation for the χ±₁ χ⁰₂,₃ production followed by χ±₁ → W± χ⁰₁ and χ⁰₂,₃ → Zχ⁰₁. By examining the presently available trilepton bounds on the wino-like chargino/neutralino, we find that only a narrow region 40GeV mχ⁰₁ 50GeV and 160GeV mχ⁰₂,₃ 170 GeV on the plane of mχ⁰₁-mχ⁰₂,₃ can be excluded. Finally, we explore the potential of trilepton signature in probing such a scenario at 14 TeV LHC and find that the region with 40GeV mχ⁰₁ 60 GeV and 160 GeV mχ⁰₂,₃ 300GeV can be covered at 3σ level with luminosity L=300 fb⁻¹.