Abstract
We argue that combining just a handful of searches for new physics at Run I of the LHC is sufficient to exclude most supersymmetric extensions of the Standard Model in which the gluino is kinematically accessible and the spectrum is natural. Such models typically give rise to significant MET, top quarks and/or high object multiplicity, and we show that having even one of these signatures generally results in stringent limits. We also identify, among models that lack these signatures, the few gaps in coverage remaining, and propose search strategies to close these gaps. Our results are general and independent of the details of the spectrum, assumptions about minimality, R-parity, etc. Our analysis strategy should remain applicable when the LHC moves to higher energy. Central to our argument are ATLAS and CMS searches for many jets and low MET, a proposed lepton + many jets search, an ATLAS search for 6-7 high-pT jets, and a reexamination of the control and signal regions of the CMS black hole search.
Highlights
As we prepare for the restart of the LHC in 2015, it is an ideal time to take stock of what we have learned from Run I at 7–8 TeV
We show a plot that explores the mHV model as a function of the masses mS and mS, at fixed gluino mass of 750 GeV
They show that the lower-right corner represents the MSSM-like region, where there is no loss of E/T, while the upper-left is the R-parity violation (RPV)-like region where the E/T has been entirely replaced by two jets per gluino
Summary
As we prepare for the restart of the LHC in 2015, it is an ideal time to take stock of what we have learned from Run I at 7–8 TeV. Since most LHC searches have been updated to the full dataset (20 fb−1 at 8 TeV), we can endeavor to glean as much insight from them as possible. The discovery of a Standard Model-like Higgs at 125 GeV [1, 2] reinforces the urgency of the hierarchy problem, for which supersymmetry (SUSY) remains one of the best-motivated candidates for a natural solution. For reviews encompassing both the theory of natural SUSY and recent LHC results, see [3, 4].
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