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A simple technique for combining simplified models and its application to direct stop production
High Energy Physics - Phenomenology · Submitted 13 Feb 2014
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find that current ATLAS and CMS results exclude stop masses up to 340 GeV for neutralino masses up to 120 GeV, provided that the total branching ratio into channels other than top-neutralino and bottom-chargino is small, and that there is no mass difference smaller than 10 GeV in the mass spectrum.
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The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
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The abstract, sentence by sentence
The results of many LHC searches for supersymmetric particles are interpreted using simplified models, in which one fixes the masses and couplings of most sparticles then scans over a few remaining masses of interest. We present a new technique for combining multiple simplified models (that requires no additional simulation) thereby highlighting the utility and limitations of simplified models in general, and demonstrating a simple way of improving LHC search strategies. The technique is used to derive limits on the stop mass that are model independent, modulo some reasonably generic assumptions which are quantified precisely. We find that current ATLAS and CMS results exclude stop masses up to 340 GeV for neutralino masses up to 120 GeV, provided that the total branching ratio into channels other than top-neutralino and bottom-chargino is small, and that there is no mass difference smaller than 10 GeV in the mass spectrum. In deriving these limits we place upper bounds on the branching ratios for complete stop pair decay processes for many values of the stop, neutralino and chargino masses. These are available with this paper.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The results of many LHC searches for supersymmetric particles are interpreted using simplified models, in which one fixes the masses and couplings of most sparticles then scans over a few remaining masses of interest. | background 1.00 | 0.05 | 0.03 | asserted 1.00 |
| s1 | We present a new technique for combining multiple simplified models (that requires no additional simulation) thereby highlighting the utility and limitations of simplified models in general, and demonstrating a simple way of improving LHC search strategies. | contribution 1.00 | 0.95 | 0.19 | asserted 1.00 |
| s2 | The technique is used to derive limits on the stop mass that are model independent, modulo some reasonably generic assumptions which are quantified precisely. | result 0.42 | 0.95 | 0.20 | asserted 0.99 |
| s3 | We find that current ATLAS and CMS results exclude stop masses up to 340 GeV for neutralino masses up to 120 GeV, provided that the total branching ratio into channels other than top-neutralino and bottom-chargino is small, and that there is no mass difference smaller than 10 GeV in the mass spectrum. | result 1.00 | 0.95 | 0.75 | asserted 1.00 |
| s4 | In deriving these limits we place upper bounds on the branching ratios for complete stop pair decay processes for many values of the stop, neutralino and chargino masses. | method 0.76 | 0.95 | 0.05 | asserted 1.00 |
| s5 | These are available with this paper. | contribution 0.80 | 0.57 | 0.02 | asserted 0.98 |
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The paper
Original abstract
The results of many LHC searches for supersymmetric particles are interpreted using simplified models, in which one fixes the masses and couplings of most sparticles then scans over a few remaining masses of interest. We present a new technique for combining multiple simplified models (that requires no additional simulation) thereby highlighting the utility and limitations of simplified models in general, and demonstrating a simple way of improving LHC search strategies. The technique is used to derive limits on the stop mass that are model independent, modulo some reasonably generic assumptions which are quantified precisely. We find that current ATLAS and CMS results exclude stop masses up to 340 GeV for neutralino masses up to 120 GeV, provided that the total branching ratio into channels other than top-neutralino and bottom-chargino is small, and that there is no mass difference smaller than 10 GeV in the mass spectrum. In deriving these limits we place upper bounds on the branching ratios for complete stop pair decay processes for many values of the stop, neutralino and chargino masses. These are available with this paper.
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References
How the literature uses it
7 arXiv papers cite this in 7 sentences
What it cites · 20 sentences without a confident label
Uses the method or tool of 6 papers
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Stop pair production cross-sections for each model are calculated at next-to-leading order using PROSPINO 2.1 [ref] .
PROSPINO: A Program for the Production of Supersymmetric Particles in Next-to-leading Order QCD · Simulation details · 1.00
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A key idea for obtaining non-trivial limits was to consider a simplified model for mixed decays [ref] , where pair produced stops each decay via a different decay mode.
Hunting Asymmetric Stops · Conclusions · 0.91
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Calculating the total branching ratio of stops into states other than the lightest neutralino or chargino using SUSY-HIT 1.3 [ref] , we find that around 25% of models have a branching ratio into missing final states of less than 5%.
Decays of Supersymmetric Particles: the program SUSY-HIT (SUspect-SdecaY-Hdecay-InTerface) · “Model independent” limits on the stop quark mass · 1.00
Compares with 1 paper
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In the cases of the limits from the ATLAS 2 $b$-jet analysis [ref] , the limits in the $m_χ̃^±=150$ GeV and $Δm=m_χ̃^±-m_χ̃^0=20$ GeV planes did not immediately agree with those released by ATLAS.
Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in sqrt{s}=8 TeV pp collisions with the ATLAS detector · Simulation details · 0.83
Cites as background 9 papers
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The limit of applicability of simplified model limits is, however, rarely explored, and neither is there a well defined procedure for combining information from different simplified models to obtain sparticle mass limits in more realistic scenarios (though the use of simplified models to obtain limits in GUT scale SUSY models was considered in [ref] ).
Setting limits on supersymmetry using simplified models · Simplified models for direct stop production · 0.83
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Supersymmetry (SUSY) remains one of the best motivated candidates for solving the hierarchy problem of the Standard Model, but the non-observation of sparticle production at the Large Hadron Collider (LHC) and the observed Standard Model-like Higgs mass of 125 GeV are forcing us to reassess the tuning present in SUSY models [ref] .
Hide and Seek With Natural Supersymmetry at the LHC · Introduction · 0.92
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Supersymmetry (SUSY) remains one of the best motivated candidates for solving the hierarchy problem of the Standard Model, but the non-observation of sparticle production at the Large Hadron Collider (LHC) and the observed Standard Model-like Higgs mass of 125 GeV are forcing us to reassess the tuning present in SUSY models [ref] .
Natural Supersymmetry: LHC, dark matter and ILC searches · Introduction · 0.92
Discussion
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