Supersymmetry without a light Higgs boson at the CERN LHC

Abstract

We analyze the LHC phenomenology of $\ensuremath{\lambda}\mathrm{SUSY}$---a version of the next-to-minimal supersymmetric standard model with a large-ish $S{H}_{1}{H}_{2}$ coupling. The scalar spectrum of the model contains a 200--300 GeV Higgs boson $h$ with standard-model like properties, and heavy $CP$-even and $CP$-odd Higgs bosons $H$ and $A$ with masses in 500--800 GeV range. We study the discovery potential of $H$ and $A$ in the decay chains $H\ensuremath{\rightarrow}hh\ensuremath{\rightarrow}4V\ensuremath{\rightarrow}2l6j$ and $A\ensuremath{\rightarrow}Zh\ensuremath{\rightarrow}Z2V\ensuremath{\rightarrow}2l4j$. The dominant backgrounds are the diffuse $Z6j$ and $Z4j$ productions, which can be suppressed by demanding reconstruction of $V$'s and $h$'s in intermediate states. The excess of signal events allows for a discovery of both $H$ and $A$ with over $5\ensuremath{\sigma}$ significance for $100\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity.