Detecting gluinos at hadron supercolliders.

Abstract

If the gluino mass exceeds 150--200 GeV, searches for gluinos will likely have to be made at multi-TeV hadron colliders. Unlike the case of light gluinos (${m}_{g\ifmmode \tilde{}\else \~{}\fi{}}$\ensuremath{\lesssim}60 GeV), which dominantly decay via g\ifmmode \tilde{}\else \~{}\fi{}\ensuremath{\rightarrow}qq\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\gamma}\ifmmode \tilde{}\else \~{}\fi{}, heavy-gluino decays proceed via g\ifmmode \tilde{}\else \~{}\fi{}\ensuremath{\rightarrow}qq\ifmmode\bar\else\textasciimacron\fi{}W${\ifmmode \tilde{}\else \~{}\fi{}}_{i}$ and g\ifmmode \tilde{}\else \~{}\fi{}\ensuremath{\rightarrow}qq\ifmmode\bar\else\textasciimacron\fi{}Z${\ifmmode \tilde{}\else \~{}\fi{}}_{j}$ where W${\ifmmode \tilde{}\else \~{}\fi{}}_{i}$ and Z${\ifmmode \tilde{}\else \~{}\fi{}}_{j}$ are charged and neutral mass eigenstates in the gauge-Higgs-fermion sector. The usual missing-${p}_{T}$ signatures are altered and new strategies may be required for gluino detection. We analyze heavy-gluino and scalar-quark decays and estimate the production rates for W${\ifmmode \tilde{}\else \~{}\fi{}}_{i}$W${\ifmmode \tilde{}\else \~{}\fi{}}_{j}$, W${\ifmmode \tilde{}\else \~{}\fi{}}_{i}$Z${\ifmmode \tilde{}\else \~{}\fi{}}_{j}$, and Z${\ifmmode \tilde{}\else \~{}\fi{}}_{i}$Z${\ifmmode \tilde{}\else \~{}\fi{}}_{j}$ pairs at a 40-TeV pp collider. Since a heavy gluino decays dominantly into jets and the heavy chargino, which in turn decays into a ${Z}^{0}$ or W boson plus a lighter chargino or neutralino, a typical gluino-pair event contains several leptons and/or jets in the final state.