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

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 $\mathcal{O}(1-3.5\mathrm{GeV})$ 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.

Comments: 6 pages, 4 figures