Department of Physics and Astronomy: Publications and Other Research


Date of this Version





Copyright SISSA 2013



Radiatively-driven natural supersymmetry (RNS) potentially reconciles the Z and Higgs boson masses close to ∼ 100 GeV with gluinos and squarks lying beyond the TeV scale. Requiring no large cancellations at the electroweak scale in constructing MZ = 91.2 GeV while maintaining a light Higgs scalar with mh ≃ 125 GeV implies a sparticle mass spectrum including light higgsinos with mass ∼ 100−300 GeV, electroweak gauginos in the 300−1200 GeV range, gluinos at 1−4 TeV and top/bottom squarks in the 1-4 TeV range (probably beyond LHC reach), while first/second generation matter scalars can exist in the 5-30 TeV range (far beyond LHC reach). We investigate several characteristic signals for RNS at LHC14. Gluino pair production yields a reach up to [?] ∼ 1.7 TeV for 300 fb−1. Wino pair production — pp → [?] and [?] - leads to a unique same-sign diboson (SSdB) signature accompanied by modest jet activity from daughter higgsino decays; this signature provides the best reach up to [?] ∼ 2.1 TeV within this framework. Wino pair production also leads to final states with (WZ → 3[?]) + [?] as well as 4[?] + [?] which give confirmatory signals up to [?] ∼ 1.4 TeV. Directly produced light higgsinos yield a clean, soft trilepton signature (due to very low visible energy release) which can be visible, but only for a not-too-small a [?] mass gap. The clean SSdB signal - as well as the distinctive mass shape of the dilepton mass distribution from [?] decays if this is accessible - will mark the presence of light higgsinos which are necessary for natural SUSY. While an e+e- collider operating with [?] ~ 600 GeV should unequivocally reveal the predicted light higgsinos, the RNS model with m1/2 [?] 1 TeV may elude all LHC14 search strategies even while maintaining a high degree of electroweak naturalness.