Simplified models for a first characterization of new physics at the LHC

By Johan Alwall, P. Schuster, N. Toro. 2008

558 citations recorded by the source corpus.

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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8f31a5c534382e667c68cc88141f45644157566d

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In Nuclear and High Energy Physics

Citations in the corpus

The hunt for the rest of the Higgs bosons (2015, unknown): “J H E P 0 6 ( 2 0 1 5 ) 1 3 7 searches for supersymmetry [10–12].”
Search for electroweak production of supersymmetric particles in final states with two or three leptons at \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\odd (2018, unknown): “This paper uses simplified models [30] to search for the direct production of χ̃ 1 χ̃ − 1 , χ̃ ± 1 χ̃ 0 2 and ̃̀ ̃̀, in final states with exactly two or three electrons and muons, two χ̃0 1 particles and possibly additional jets or neutrinos.”
Natural SUSY endures (2011, methodology): “In each of the cases considered in the following, we will adopt the simplified model philosophy [106, 107], which is to only consider the relevant particles (stop/sbottom and higgsino) and to decouple the rest of the spectrum, in order to highlight the relevant”
Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at $\sqrt{s}=8$ TeV with the ATLAS detector (2015, methodology): “The signal models considered cover simplified [26, 27] and phenomenological SUSY models, as well as a minimal Universal Extra Dimension (mUED) scenario [28, 29].”
Search for direct production of charginos, neutralinos and sleptons in final states with two leptons and missing transverse momentum in pp collisions at √s = 8 TeV with the ATLAS detector (2014, unknown): “Simplified models [42] are considered for optimization of the event selection and interpretation of the results.”
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 (2019, methodology): “The design of the analysis and the interpretation of results are based on simplified models [32], where the masses of relevant sparticles (in this case the χ̃ ± 1 , ̃, ν̃ and χ̃ 0 1 ) are the only free parameters.”
Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider (2019, methodology): “In the context of searches for prompt signatures with E T, the use of simplified models has been shown to be a fruitful approach for both the experimental and theoretical communities [74, 76, 78, 87, 88, 480, 481].”
Searches for electroweak production of supersymmetric particles with compressed mass spectra in √s = 13 TeV pp collisions with the ATLAS detector (2019, methodology): “Simplified SUSY models [10–12] are used to optimize the searches and interpret the results.”
Beyond effective field theory for dark matter searches at the LHC (2013, background): “The simplified model should be chosen so that more complete UV theories can be easily mapped onto it [14–17].”
The status of GMSB after 1/fb at the LHC (2011, result): “In taking this approach, our outlook is similar to that of other recent work that advocates for studying new physics in terms of physical masses, rates, and branching ratios [28–32, 54–59], and complementary to other work in progress [60–62].”
Search for supersymmetry in proton-proton collisions at 13 TeV in final states with jets and missing transverse momentum (2019, methodology): “For this purpose, we use so-called simplified models [33–36].”
Search for new physics in the multijet and missing transverse momentum final state in proton-proton collisions at $ \sqrt{s} $ = 8 TeV (2014, methodology): “For all these searches, the observed numbers of events were consistent with the expected SM background, and exclusion limits were set in the context of the constrained minimal supersymmetric extension of the standard model (CMSSM) [18–20] and various simplified models [21, 22].”