Abstract
The search of the light Higgsino {in the Minimal Supersymmetric Standard Model (MSSM)} is a crucial test for the criteria of the naturalness in supersymmetry. On the other hand, the direct production of light Higgsino is also known as one of the most challenging SUSY searches at the current CERN Large Hadron collider (LHC). The lack of visible leptons due to the compressed spectrum and their small production rates limits their discovery potential in both mono-jet plus MET as well as the weak boson fusion (WBF) production. The signal $S/B$ ratio prediction is usually within the background systematic uncertainties at the LHC. Without color exchange between the beams, the $e-p$ colliders are well-known to have the WBF feature. Therefore, we study the search of the light Higgsinos at two future $e-p$ colliders at CERN, LHeC and FCC-eh.~The light Higgsinos will be produced in pair through weak boson fusion with controlled background at these colliders. We find the Higgsino of 95/145~GeV can be reached at 2$\sigma$ level at the future LHeC/FCC-eh with a luminosity $3 ~\text{ab}^{-1}$ respectively.
Highlights
LIGHT HIGGSINO SURVIVAL IN DIRECT SEARCHESThe ATLAS and CMS experiments at the LHC have put stringent lower bounds on the supersymmetric (SUSY) particles, excluding a large parameter space for the lowenergy SUSY models
Note that the above results are based on a 140 GeV electron beam at Large Hadron electron Collider (LHeC); we do not show the results for a 60 GeV beam since the τ backgrounds overshadow the tiny signal and the sensitivity cannot reach 2σ after detector simulations
We compare the results for Future Circular Collider in hadron-electron mode (FCC-eh) to those for LHeC
Summary
The ATLAS and CMS experiments at the LHC have put stringent lower bounds on the supersymmetric (SUSY) particles, excluding a large parameter space for the lowenergy SUSY models. The direct production of electroweak SUSY particles has a relatively small cross section, but the definite hard lepton tagging helps the search in the multilepton plus =ET final states and Oð600 GeVÞ charginos have been excluded [3]. In the conventional natural SUSY framework, the light Higgsino dark matter is completely covered by the XENON1T experiment [11,29] This bound can be evaded by decoupling the top squark and M1, M2. We discuss the survival parameter space for light Higgsinos from direct searches It is followed by a discussion of the phenomenology of this collider search, which includes signal and background event simulations, some kinematic distributions of final states, and selection cuts.
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