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Natural MSSM after the LHC 8 TeV run
High Energy Physics - Phenomenology · Submitted 22 Jul 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find that points with acceptable levels of fine-tuning are for the most part already excluded by the LHC and including the other constraints further reduces the overall naturalness of our scenarios.
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The abstract, sentence by sentence
We investigate the impact of direct LHC SUSY searches on the parameter space of three natural scenarios in the MSSM. In the first case the spectrum consists of light stops, sbottoms, and Higgsino-like neutralinos, while the other particles are assumed to be out of the experimental reach. In the second case we consider an additional light gluino. Finally we study a more complex spectrum comprising also light sleptons, a wino-like chargino, and a bino-like neutralino. We simulate in detail three LHC searches: stop production at ATLAS with 20.7/fb, CMS 11.7/fb inclusive search for squarks and gluinos with the variable \alpha_T, and CMS 9.2/fb electroweak production with 3 leptons in the final state. For each point in our scans we calculate the exclusion likelihood due to the individual searches and to their statistical combination. We calculate the fine-tuning measure of the points allowed by the LHC and the implications for the Higgs mass and other phenomenological observables: Higgs signal rates, the relic density, BR(Bs --> \mu^+\mu^-), BR(B --> Xs \gamma), and the spin-independent neutralino-proton scattering cross section. We find that points with acceptable levels of fine-tuning are for the most part already excluded by the LHC and including the other constraints further reduces the overall naturalness of our scenarios.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We investigate the impact of direct LHC SUSY searches on the parameter space of three natural scenarios in the MSSM. | contribution 0.99 | 0.90 | 0.03 | asserted 0.58 |
| s1 | In the first case the spectrum consists of light stops, sbottoms, and Higgsino-like neutralinos, while the other particles are assumed to be out of the experimental reach. | contribution 0.57 | 0.42 | 0.02 | asserted 0.93 |
| s2 | In the second case we consider an additional light gluino. | contribution 0.81 | 0.64 | 0.01 | asserted 0.81 |
| s3 | Finally we study a more complex spectrum comprising also light sleptons, a wino-like chargino, and a bino-like neutralino. | contribution 0.78 | 0.85 | 0.02 | asserted 0.90 |
| s4 | We simulate in detail three LHC searches: stop production at ATLAS with 20.7/fb, CMS 11.7/fb inclusive search for squarks and gluinos with the variable \alpha_T, and CMS 9.2/fb electroweak production with 3 leptons in the final state. | method 0.99 | 0.94 | 0.02 | asserted 0.99 |
| s5 | For each point in our scans we calculate the exclusion likelihood due to the individual searches and to their statistical combination. | method 0.99 | 0.96 | 0.03 | asserted 0.99 |
| s6 | We calculate the fine-tuning measure of the points allowed by the LHC and the implications for the Higgs mass and other phenomenological observables: Higgs signal rates, the relic density, BR(Bs --> \mu^+\mu^-), BR(B --> Xs \gamma), and the spin-independent neutralino-proton scattering cross section. | method 0.84 | 0.95 | 0.04 | asserted 0.93 |
| s7 | We find that points with acceptable levels of fine-tuning are for the most part already excluded by the LHC and including the other constraints further reduces the overall naturalness of our scenarios. | result 0.96 | 0.96 | 0.94 | asserted 1.00 |
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The paper
Original abstract
We investigate the impact of direct LHC SUSY searches on the parameter space of three natural scenarios in the MSSM. In the first case the spectrum consists of light stops, sbottoms, and Higgsino-like neutralinos, while the other particles are assumed to be out of the experimental reach. In the second case we consider an additional light gluino. Finally we study a more complex spectrum comprising also light sleptons, a wino-like chargino, and a bino-like neutralino. We simulate in detail three LHC searches: stop production at ATLAS with 20.7/fb, CMS 11.7/fb inclusive search for squarks and gluinos with the variable \alpha_T, and CMS 9.2/fb electroweak production with 3 leptons in the final state. For each point in our scans we calculate the exclusion likelihood due to the individual searches and to their statistical combination. We calculate the fine-tuning measure of the points allowed by the LHC and the implications for the Higgs mass and other phenomenological observables: Higgs signal rates, the relic density, BR(Bs --> \mu^+\mu^-), BR(B --> Xs \gamma), and the spin-independent neutralino-proton scattering cross section. We find that points with acceptable levels of fine-tuning are for the most part already excluded by the LHC and including the other constraints further reduces the overall naturalness of our scenarios.
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References
How the literature uses it
30 arXiv papers cite this in 35 sentences
Papers citing it · 19 sentences without a confident label
Uses its method or tool 4 papers
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New results from the LHC 13 TeV are taken into account by employing the recast procedure developed and described in detail in Refs. [ref] .
Phenomenological MSSM in light of new 13 TeV LHC data · 13 TeV LHC SUSY searches · 1.00
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Therefore, in order to correctly quantify the effect of this search in the $GFV_23$ scenario, we perform a full reinterpretation of the experimental analysis using the tools developed first in Ref. [ref] , and modified to recast the limits from SMS in Ref. [ref] .
Exact SU(5) Yukawa matrix unification in the General Flavour Violating MSSM · LHC direct SUSY searches · 0.90
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The exclusion bounds are set according to a marginalized likelihood ratio method, with the Poisson likelihood distribution marginalized over the background and normalized to the background-only hypothesis as described in Sec. 3 of [ref] .
GUT-inspired SUSY and the muon g-2 anomaly: prospects for LHC 14 TeV · Numerical implementation of LHC searches · 1.00
Uses its data or values 1 paper
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In [ref] , a study of “natural SUSY” production recasted three 8 TeV LHC searches and found that $m_g̃≳1.2$ TeV and $m_t̃≳700$ TeV for $m_H̃≲300$ GeV for a few simplified models with tops and in the final state.
Status and Implications of BSM Searches at the LHC · Broader Implications · 0.91
Cites it as background 9 papers
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Phenomenological studies of natural SUSY scenarios at the LHC have been performed in [ref] .
Minimal Natural Supersymmetry after the LHC8 · Introduction · 0.95
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(For some recent studies of models of this type in the context of the LHC, see [ref] .) Here, decays of pair-produced gluinos such as [equation] result in three characteristic properties that can be used to distinguish them from Standard Model (SM) backgrounds: * Substantial missing transverse momentum () * Top quarks (resulting in a $b$ jet, plus either $jj$ or $ℓν$) * High multiplicity of objects ($N≳8$)
Toward Full LHC Coverage of Natural Supersymmetry · Introduction · 0.91
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Interpretations of the present constraints from the trilepton channel in realistic versions of the MSSM have been performed in [ref] (see [ref] for the rôle of trilepton final states in some beyond-the-MSSM models).
Testing the higgsino-singlino sector of the NMSSM with trileptons at the LHC · Introduction · 0.82
What it cites · 51 sentences without a confident label
Builds on 1 paper
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We extend the procedure developed in [ref] .
Dark matter and collider signatures of the MSSM · LHC SUSY limits · 1.00
Uses the method or tool of 13 papers
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For every point in the parameter space we calculate the decay BR with [ref] , generate 5000 events at the scattering level with [ref] , and pass the hadronization products to the fast detector simulator [ref] .
PYTHIA 6.4 Physics and Manual · LHC SUSY limits · 1.00
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For every point in the parameter space we calculate the decay BR with [ref] , generate 5000 events at the scattering level with [ref] , and pass the hadronization products to the fast detector simulator [ref] .
Decays of Supersymmetric Particles: the program SUSY-HIT (SUspect-SdecaY-Hdecay-InTerface) · LHC SUSY limits · 1.00
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The mass spectra are calculated with [ref] , and with [ref] , the relic density and with [ref] .
micrOMEGAs2.0: a program to calculate the relic density of dark matter in a generic model · Naturalness in the MSSM · 1.00
Uses data or values from 5 papers
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For each scenario we create a sample of more than 5000 points subject to the following constraints, whose central values are taken from Table 2 of Ref. [ref] and the uncertainties are obtained from the same table by adding the experimental and theoretical errors in quadrature. and are always satisfied at $2σ$.[With respect to Table 2 of Ref. [ref] , the measured value of was very recently updated by the LHCb and CMS Collaborations [ref] .
Measurement of the $B^0_s \to \mu^+ \mu^-$ branching fraction and search for $B^0 \to \mu^+ \mu^-$ decays at the LHCb experiment · Naturalness in the MSSM · 0.98
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For each scenario we create a sample of more than 5000 points subject to the following constraints, whose central values are taken from Table 2 of Ref. [ref] and the uncertainties are obtained from the same table by adding the experimental and theoretical errors in quadrature. and are always satisfied at $2σ$.[With respect to Table 2 of Ref. [ref] , the measured value of was very recently updated by the LHCb and CMS Collaborations [ref] .
Measurement of the B(s) to mu+ mu- branching fraction and search for B0 to mu+ mu- with the CMS Experiment · Naturalness in the MSSM · 0.98
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For each scenario we create a sample of more than 5000 points subject to the following constraints, whose central values are taken from Table 2 of Ref. [ref] and the uncertainties are obtained from the same table by adding the experimental and theoretical errors in quadrature. and are always satisfied at $2σ$.[With respect to Table 2 of Ref. [ref] , the measured value of was very recently updated by the LHCb and CMS Collaborations [ref] .
Dark matter and collider signatures of the MSSM · Naturalness in the MSSM · 0.98
Compares with 4 papers
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In particular, for gluinos decaying to stops, the bounds are comparable to the ones from the CMS $HT$, $b$-jets and MET search with 19.4 [ref] and, for $m_≲400$, to the bounds from the opposite-sign leptons + $b$-jets searches at CMS and ATLAS [ref] and the 3-lepton + $b$-jets search with 19.5 at CMS [ref] .
Search for new physics in events with same-sign dileptons and b jets in pp collisions at sqrt(s) = 8 TeV · CMS 0-leptons + ($b$-)jets + $E_T^miss$ with , 12 · 0.95
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In particular, for gluinos decaying to stops, the bounds are comparable to the ones from the CMS $HT$, $b$-jets and MET search with 19.4 [ref] and, for $m_≲400$, to the bounds from the opposite-sign leptons + $b$-jets searches at CMS and ATLAS [ref] and the 3-lepton + $b$-jets search with 19.5 at CMS [ref] .
Search for gluino mediated bottom- and top-squark production in multijet final states in pp collisions at 8 TeV · CMS 0-leptons + ($b$-)jets + $E_T^miss$ with , 12 · 0.95
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Note that the results presented in fig:LHC_S1fig:b and fig:LHC_S1fig:c are in a good agreement with Fig. 7 of Ref. [ref] , where the limits from five CMS and ATLAS stop/sbottom searches were combined for a model with light and almost degenerate $t̃_1$, $t̃_2$ and $b̃_1$ in the spectrum.
Natural Supersymmetry and Implications for Higgs physics · Scenario 1 · 1.00
Cites as support 1 paper
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This could be due to the presence of two (or more) particles producing indistinguishable signatures at the detector level, as recently shown in [ref] , where a LHC analysis of Natural SUSY-type of spectra involving light Higgsinos, $t̃_L$, $b̃_L$, and $t̃_R$ was performed.
Natural Supersymmetry and Implications for Higgs physics · Introduction · 0.96
Cites as background 12 papers
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(Addition of extra sectors can ameliorate this problem by raising the value of the tree-level Higgs mass, like in the case of the Next-to-Minimal Supersymmetric SM [ref] , or in interesting alternatives like [ref] .) On the other hand, since $Δ$ is generally larger in the case with multi-TeV stop masses than in the case where the correct Higgs mass is obtained thanks to maximal stop mixing, the idea of Natural SUSY, which finds its origin in many of the papers cited in Ref. [ref] and also includes the concept of Effective SUSY [ref] , has seen a revival in the last couple of years [ref] .
Supersymmetry, Naturalness, and Signatures at the LHC · Introduction · 0.88
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(Addition of extra sectors can ameliorate this problem by raising the value of the tree-level Higgs mass, like in the case of the Next-to-Minimal Supersymmetric SM [ref] , or in interesting alternatives like [ref] .) On the other hand, since $Δ$ is generally larger in the case with multi-TeV stop masses than in the case where the correct Higgs mass is obtained thanks to maximal stop mixing, the idea of Natural SUSY, which finds its origin in many of the papers cited in Ref. [ref] and also includes the concept of Effective SUSY [ref] , has seen a revival in the last couple of years [ref] .
The More Minimal Supersymmetric Standard Model · Introduction · 0.88
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(Addition of extra sectors can ameliorate this problem by raising the value of the tree-level Higgs mass, like in the case of the Next-to-Minimal Supersymmetric SM [ref] , or in interesting alternatives like [ref] .) On the other hand, since $Δ$ is generally larger in the case with multi-TeV stop masses than in the case where the correct Higgs mass is obtained thanks to maximal stop mixing, the idea of Natural SUSY, which finds its origin in many of the papers cited in Ref. [ref] and also includes the concept of Effective SUSY [ref] , has seen a revival in the last couple of years [ref] .
A Natural SUSY Higgs Near 125 GeV · Introduction · 0.88
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