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Simplified Models for a First Characterization of New Physics at the LHC
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Low-energy SUSY and several other theories that address the hierarchy problem predict pair-production at the LHC of particles with Standard Model quantum numbers that decay to jets, missing energy, and possibly leptons. If an excess of such events is seen in LHC data, a theoretical framework in which to describe it will be essential to constraining the structure of the new physics. We propose a basis of four deliberately simplified models, each specified by only 2-3 masses and 4-5 branching ratios, for use in a first characterization of data. Fits of these simplified models to the data furnish a quantitative presentation of the jet structure, electroweak decays, and heavy-flavor content of the data, independent of detector effects. These fits, together with plots comparing their predictions to distributions in data, can be used as targets for describing the data within any full theoretical model.
Forward citations
Cited by 9 Pith papers
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Search for long-lived charginos and $\tau$-sleptons using final states with a disappearing track in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
No excess found in 137 fb^-1 of 13 TeV pp data; new 95% CL exclusions reach chargino masses up to 880 GeV and tau-sleptons up to 320 GeV at ~1 ns lifetimes.
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Search for higgsinos in compressed mass spectra using low-momentum tracks in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
No excess over the Standard Model is observed; ATLAS excludes chargino masses below 126 GeV at 95% CL for mass splittings of 0.3–2 GeV in a simplified higgsino model.
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Connecting $t$-channel Dark Matter Models to the Standard Model Effective Field Theory
One-loop SMEFT Wilson coefficients for leptophilic t-channel dark matter, combined with global fits, exclude large coupling regions, especially C_ell_ell for doublet mediators and C_ed above 3 TeV.
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Effective field theory and scalar extensions of the top quark sector
For a heavy scalar coupled to top quarks, only an NLO-matched effective field theory reproduces the full model across the LHC energy range, while a leading-order fit overestimates the high-mass tail and LHC constraints.
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Search for bottom-squark pair production with the ATLAS detector in final states containing Higgs bosons, $b$-jets and missing transverse momentum
A search for bottom-squark pairs decaying into Higgs bosons, b-quarks, and missing energy found no excess and excluded bottom-squark masses up to 1.5 TeV.
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Search for the pair production of long-lived supersymmetric partners of the tau lepton in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No long-lived staus are observed; CMS excludes stau masses up to 425 GeV at 50 mm lifetime (mass-degenerate) and decay lengths 21-94 mm / 6-333 mm at 200 GeV.
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DeepMET: Improving missing transverse momentum estimation with a deep neural network
DeepMET is a neural-network-based missing transverse momentum estimator that improves resolution by 10-30% over existing CMS methods across a range of final states.
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Search for electroweak production of charginos and sleptons decaying into final states with two leptons and missing transverse momentum in $\sqrt{s}=13$ TeV $pp$ collisions using the ATLAS detector
Using 139 fb^-1 of 13 TeV pp data, ATLAS finds no sign of charginos or sleptons and excludes chargino masses up to 420 GeV (W-mediated) and slepton masses up to 700 GeV for a massless LSP.
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Search for supersymmetry in proton-proton collisions at 13 TeV in final states with jets and missing transverse momentum
A 137 fb^-1 CMS search in the jets-plus-missing-momentum final state finds no supersymmetry excess and sets new 95% CL lower limits of up to 2310 GeV on the gluino mass and 1630 GeV on the squark mass.
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