Exploring nearly degenerate higgsinos using mono-$Z/W$ signal

TL;DR

This paper introduces a novel search strategy for nearly degenerate higgsinos at the LHC, utilizing missing energy and hadronic vector boson tagging to improve sensitivity and extend exclusion limits.

Contribution

It proposes a new search method focusing on associated production with W/Z bosons and the use of $E_T^ ext{miss}$ distribution to enhance detection sensitivity for nearly degenerate higgsinos.

Findings

Higgsinos up to 110 GeV can be excluded with 139 fb^{-1} data.

Higgsinos up to 210 GeV can be excluded with 300 fb^{-1} data.

Full HL-LHC data can exclude up to 520 GeV and discover up to 280 GeV higgsinos.

Abstract

We propose a new search strategy for higgsinos. Assuming associated production of higgsino-like pairs with a $W$ or $Z$ boson, we search in the missing energy plus hadronically-tagged vector boson channel. We place sensitivity limits for (HL-)LHC searches assuming $\mathcal{O}({1\mathrm{-}3.5}~\mathrm{GeV})$ mass differences between the lightest neutral and charged states. We point out that using the $E_T^\mathrm{miss}$ distribution significantly increases the sensitivity of this search. We find the higgsinos up to 110 (210) GeV can be excluded with $139~(300)~\mathrm{fb}^{-1}$ data. The full data of the HL-LHC will exclude (discover) the higgsinos up to 520 (280) GeV.