Summary plots from the ATLAS Supersymmetry physics group

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Summary plots from the ATLAS Supersymmetry physics group
Contact: ATLAS Supersymmetry conveners
The 95% CL exclusion limits on χ₁⁺χ₁^- and χ₁^±χ₂⁰ production with either SM-boson-mediated or ℓ-mediated decays, as a function of the χ₁^±, χ₂⁰ and χ₁⁰ masses. The production cross-section is for pure wino χ₁⁺χ₁^- and χ₁^±χ₂⁰. Each individual exclusion contour represents a union of the excluded regions of one or more analyses. Status of figure: March 2019 png 212kB, pdf 21kB This and previous plot versions
Exclusion limits at 95% CL based on 13 TeV data in the (slepton, lightest neutralino) mass plane for different analyses probing the direct production of sleptons with decays to lepton neutralino. The types of sleptons (flavor and coupling) included in each search is specified in the legend. Status of figure: March 2019 png 53kB, pdf 212kB This and previous plot versions
The 95% CL exclusion limits on a general gauge mediation model from 13 TeV data. The model assumes a pure Higgsino NLSP that promptly decays to either Z gravitino or Higgs gravitino. The limits are displayed as a function of the mass of the nearly mass-degenerate Higgsino triplet and the branching fraction of lightest Higgsino to Higgs gravitino. Status of figure: July 2018 png 38kB, pdf 18kB This and previous plot versions
Exclusion limits at 95% CL for higgsino pair production χ₁⁺χ₁^-, χ₁^±χ₁⁰, χ₁^±χ₂⁰, and χ₁⁰χ₂⁰ with off-shell SM-boson-mediated decays to the lightest neutralino, χ₁⁰, as a function of the χ₁^± and χ₁⁰ masses. The production cross-section is for pure higgsinos. Status of figure: March 2018 png 485kB, pdf 252kB This and previous plot versions
The 95% CL exclusion limits on χ₁⁺χ₁^- and χ₁^±χ₂⁰ production with ℓ-mediated decays, as a function of the χ₁^±, χ₂⁰ and χ₁⁰ masses. The production cross-section is for pure wino χ₁⁺χ₁^- and χ₁^±χ₂⁰. Each individual exclusion contour represents a union of the excluded regions of one or more analyses. Status of figure: March 2019 png 193kB, pdf 20kB This and previous plot versions
The 95% CL exclusion limits on χ₁⁺χ₁^- and χ₁^±χ₂⁰ production with SM-boson-mediated decays, as a function of the χ₁^±, χ₂⁰ and χ₁⁰ masses. The production cross-section is for pure wino χ₁⁺χ₁^- and χ₁^±χ₂⁰. Each individual exclusion contour represents a union of the excluded regions of one or more analyses. Status of figure: March 2019 png 208kB, pdf 20kB This and previous plot versions
Exclusion limits at 95% CL based on 13 !TeV data in the (gluino, lightest neutralino) mass plane for the Gtt simplified model where a pair of gluinos decays promptly via off-shell top squarks to four top quarks and two lightest neutralinos. Theoretical signal cross section uncertainties are not included in the limits shown. Status of figure: December 2018 png 161kB, pdf 18kB This and previous plot versions
Constraints on the gluino mass-vs-lifetime plane for a split-supersymmetry model with the gluino R-hadron decaying into a gluon or light quarks and a neutralino with mass of 100 !GeV. The solid lines indicate the observed limits, while the dashed lines indicate the expected limits. The area below the curves is excluded. For the displaced vertices result the expected and observed limits are identical. For the stopped gluino result the limit extends to larger lifetimes (not quoted here, see reference). The analyses have sensitivity at lifetimes other than those shown, but only the limits at tested lifetimes are shown. The dots represent results for which the particle is assumed to be prompt or stable. In this context, stable means escaping the detector. Status of figure: March 2019 png 179kB, pdf 18kB This and previous plot versions
Constraints on the chargino mass-vs-lifetime plane for an AMSB model with tan(β)=5 and μ>0. The wino-like chargino is pair-produced and decays to the wino-like neutralino and a very soft charged pion. The solid lines indicate the observed limits, while the dashed lines indicate the expected limits. The area below the curves is excluded. The analyses have sensitivity at lifetimes other than those shown, but only the limits at tested lifetimes are shown. The dots represent results for which the particle is assumed to be stable. In this context, stable means escaping the detector. Status of figure: March 2019 png 150kB, pdf 22kB This and previous plot versions
Exclusion limits at 95% CL for 8 TeV analyses in the (m₀, m_1/2) plane for the MSUGRA/CMSSM model with the remaining parameters set to tan(β) = 30, A₀ = -2m₀, μ > 0. Part of the model plane accommodates a lightest neutral scalar Higgs boson mass of 125 GeV. This plot is from: 1507.05525 (Summary of the searches for squarks and gluinos using sqrt(s) = 8 TeV pp collisions with the ATLAS experiment at the LHC). Status of figure: EPS 2015 png 428kB, pdf 28kB This and previous plot versions
Each vertical bar is a 1D projection of the fraction of model points excluded, with colour coding representing the fraction of model points excluded for each sparticle. One interesting feature can be seen in the case of the $\tilde{\chi}_1^\pm$ where the fraction of model points decreases to almost 0 at 1 TeV and then increases again at around 1.5 TeV. This is because the chargino mass is correlated with the neutralino mass in the case of the wino and Higgsino model points and so a heavy $\tilde{\chi}_1^\pm$ means a heavy LSP. The decrease in sensitivity to the chargino around 1 TeV is an artefact of weighting the bino model points by a factor of 1/24, because in bins around this region there are relatively few bino-LSP model points and so their contribution to the fraction of model points excluded is negligible. As the chargino mass increases, there are fewer model points with wino or Higgsino models and so the fraction of model points excluded is then only representative of the bino-LSP models. png 69kB, pdf 18kB This and previous plot versions
Exclusion limits for colour-neutral ttbar/bbbar+a pseudoscalar models as a function of the mediator mass for a dark matter mass of 1 GeV. The limits are calculated at 95% CL and are expressed in terms of the ratio of the excluded cross-section to the nominal cross-section for a coupling assumption of g = g_q = g_chi = 1. The solid (dashed) lines show the observed (expected) exclusion limits for different analyses. Status of figure: December 2016 png 23kB, pdf 14kB This and previous plot versions
Exclusion limits at 95% CL based on 13 !TeV data in the (gluino, lightest neutralino) mass plane for different simplified models featuring the decay of the gluino to the lightest supersymmetric particle (lightest neutralino) which in turn decays via R-parity violating couplings to Standard Model particles. For each line, the gluino decay mode is reported in the legend and it is assumed to proceed with 100% branching ratio. Some limits depend on additional assumptions, as described in the references provided in the plot. Status of figure: March 2018 png 572kB, pdf 70kB This and previous plot versions
Summary of 95% CL exclusion limits as a function of the squark mass for different simplified models featuring the decay of squarks via R-parity violating couplings. For each line, the squark decay mode is reported in the legend and it is assumed to proceed with 100% branching ratio. Some limits depend on additional assumptions, as described in the references provided in the plot. Status of figure: July 2018 png 414kB, pdf 175kB This and previous plot versions
Exclusion limits at 95% CL in the (lightest sbottom, lightest neutralino) mass plane for direct sbottom production. The lightest neutralino (χ₁⁰) is assumed to be the lightest SUSY particle (LSP). Several different decay scenarios are shown, along with different parameterizations of the intermediate particles in the models. Status of figure: March 2019 png 181kB, pdf 20kB This and previous plot versions
Exclusion limits at 95% CL in the (lightest sbottom, lightest neutralino) mass plane for direct sbottom production. The lightest neutralino (χ⁰₁) is assumed to be the lightest SUSY particle (LSP). Two different decay scenarios are shown, covering different relative rates of the decays of b₁ → b χ⁰₁ and b₁ → t χ^±₁. In the latter case, the lightest chargino (χ^±₁) is assumed to be the next-to-LSP, with a mass almost degenerate with the LSP. Status of figure: December 2018 png 67kB, pdf 17kB This and previous plot versions
Exclusion limits for colour-neutral ttbar/bbbar+phi scalar models as a function of the mediator mass for a dark matter mass of 1 GeV. The limits are calculated at 95% CL and are expressed in terms of the ratio of the excluded cross-section to the nominal cross-section for a coupling assumption of g = g_q = g_chi = 1. The solid (dashed) lines show the observed (expected) exclusion limits for different analyses. Status of figure: December 2016 png 162kB, pdf 14kB This and previous plot versions
Exclusion limits at 95% CL in the (lightest stop, lightest neutralino) mass plane for direct stop production. Different assumptions regarding the lightest (LSP) and next to lightest supersymmetric particle (NLSP) are shown. In the wino model, the wino mass eigenstates (χ^±₁, χ⁰₂) are twice as heavy as the bino. The results are shown separately for a positive and a negative higgsino mass parameter (μ>0 and μ<0), as this influences the χ⁰₂ decay branching ratios. The pure wino limit from the ATLAS electroweak jigsaw analysis is also shown in yellow for the same hypothesis on the wino mass eigenstates. The higgsino LSP scenario assumes a mass-splitting amongst the higgsino mass eigenstates (χ⁰₂, χ^±₁ and χ⁰₁) of 5 GeV. The results are shown separately for different stop left-right mixing, as this influences the t₁ decay branching ratios. The pure higgsino limit from the ATLAS electroweak search in scenarios with compressed mass spectra is also superimposed in dark green. The open contours indicate regions of the mass plane not yet explored for that hypothesis. Status of figure: December 2018 png 50kB, pdf 52kB This and previous plot versions
Summary of the dedicated ATLAS searches for top squark (stop) pair production based on 13 fb⁻¹ of pp collision data taken at √s = 13 TeV. In the following "N1" ("C1") stands for the lightest neutralino (chargino). Exclusion limits at 95% CL are shown in the stop1-N1 mass plane. The dashed and solid lines show the expected and observed limits, respectively, including all uncertainties except the theoretical signal cross section uncertainty (PDF and scale). The decay mode stop1 → b+C1 with C1->W()+N1 is assumed with 100% BR. Various hypotheses on the stop1, C1 and N1 mass hierarchy are used: fixed C1 mass (106 GeV, 150 GeV), m(C1) ~ 2 × m(N1), fixed Delta M = m(stop1)−m(C1) at 10 GeV, and fixed Delta M = m(C1)−(N1) at 5 GeV. Note that these plots overlay contours belonging to different stop decay channels, different sparticle mass hierarchies, and simplified decay scenarios. Care must be taken when interpreting them.* Status of figure: August 2016 png 372kB, pdf 77kB This and previous plot versions
Summary of 95% CL exclusion limits in the (lightest stop, lightest neutralino) mass plane for direct stop and sbottom production assuming a "well-tempered neutralino" SUSY model where the lightest neutralinos and charginos are an admixture of bino and higgsino. This scenario is motivated by naturalness arguments and provides a dark matter candidate with the right relic density. The stop and sbottom can decay in several modes to the LSP, all of which are considered (as indicated on the plot). The corresponding branching ratios vary mostly as a function of the stop left-right mixing, and the sum of the branching ratios is bound to unity. The results are shown separately for two stop left-right mixing scenarios. Status of figure: March 2018 png 377kB, pdf 17kB This and previous plot versions
Summary of 95% CL exclusion limits in the (lightest stop, lightest neutralino) mass plane for direct stop and sbottom production assuming a SUSY model with the bino as the lightest SUSY particle (LSP) and the wino as the next-to- LSP, and the wino mass eigenstates (χ₁^±, χ₂⁰) approximately twice as heavy as the bino LSP (χ₁⁰). This scenario is motivated by gauge unification at the GUT scale. The stop and sbottom can decay in several modes to the LSP, all of which are considered (as indicated on the plot). The corresponding branching ratios vary across the mass plane, and the sum of the branching ratios is bound to unity. The results are shown separately for a positive and a negative higgsino mass parameter (μ>0 and μ<0), as this influences the branching ratios. Status of figure: March 2018 png 625kB, pdf 22kB This and previous plot versions
Summary of the dedicated ATLAS searches for top squark (stop) pair production based on 20 fb⁻¹ of pp collision data taken at √s = 8 TeV, and 4.7 fb⁻¹ of pp collision data taken at √s = 7 TeV. In the following "N1" ("C1") stands for the lightest neutralino (chargino). Exclusion limits at 95% CL are shown in the C1-N1 mass plane, assuming stop1 → b+C1 with C1->W()+N1 at BR=100% and stop1 mass at 300 GeV. The dashed and solid lines show the expected and observed limits, respectively, including all uncertainties except the theoretical signal cross section uncertainty (PDF and scale). Status of figure: July 2014* png 265kB, pdf 13kB, eps 38kB This and previous plot versions
Summary of 95% CL exclusion limits in the (lightest stop, lightest neutralino) mass plane for direct stop production assuming a SUSY model with the higgsino as the lightest SUSY particle (LSP), and a mass-splitting amongst the higgsino mass eigenstates (χ₂⁰, χ₁^±, and χ₁⁰) of 5 !GeV. This scenario is motivated by naturalness arguments. The stop can decay in several modes to the LSP, all of which are considered (as indicated on the plot). The corresponding branching ratios vary mostly as a function of the stop left-right mixing and tan(β) (ratio of the up- and down-type Higgs VEVs), and the sum of the branching ratios is bound to unity. The results are shown separately for three stop left-right mixing and tan(β) scenarios. Status of figure: March 2018 png 501kB, pdf 22kB This and previous plot versions
Summary of the dedicated ATLAS searches for top squark (stop) pair production based on 36 fb-1 of pp collision data taken at √s = 13 TeV. Exclusion limits at 95% CL are shown in the stop1-neutralino1 mass plane. The dashed and solid lines show the expected and observed limits, respectively, including all uncertainties except the theoretical signal cross section uncertainty (PDF and scale). Four decay modes are considered separately with 100% BR: stop1 → t+neutralino1 ( where the stop1 is mostly right), stop → W+b+neutralino1 (3-body decay for m(stop) < m(top) + m(neutralino1) ), stop → c + neutralino1 and stop → f+f'+b+neutralino1 (4-body decay). The latter two decay modes are superimposed. Note that these plots overlay contours belonging to different stop decay channels, different sparticle mass hierarchies, and simplified decay scenarios. Care must be taken when interpreting them. Status of figure: December 2017 png 690kB, pdf 272kB This and previous plot versions
Exclusion limits at 95% CL based on 13 !TeV data in the (gluino, lightest neutralino) mass plane for the simplified model where a pair of gluinos are produced, and each decays promptly via an on-shell chargino to a pair of quarks, a W boson, and the lightest neutralino. The chargino mass is assumed to be mid-way between the gluino and neutralino masses.Theoretical signal cross section uncertainties are not included in the limits shown. Status of figure: December 2018 png 166kB, pdf 18kB This and previous plot versions
Exclusion limits at 95% CL based on 13 !TeV data in the (gluino, lightest neutralino) mass plane for the simplified model where a pair of gluinos are produced, and each decays promptly via an the lightest chargino and the second lightest neutralino to a pair of quarks, a W boson, a Z boson, and the lightest neutralino. The assumptions for the masses of the lightest chargino and the second lightest neutralino are reported in the plot .Theoretical signal cross section uncertainties are not included in the limits shown. Status of figure: December 2018 png 191kB, pdf 17kB This and previous plot versions
Exclusion limits at 95% CL based on 13 !TeV data in the (gluino, lightest neutralino) mass plane for different simplified models featuring the decay of the gluino to the lightest supersymmetric particle (lightest neutralino or gravitino) either directly or through a cascade chain featuring other SUSY particles with intermediate masses. For each line, the gluino decay mode is reported in the legend and it is assumed to proceed with 100% branching ratio. Some limits depend on additional assumptions on the mass of the intermediate states, as described in the references provided in the plot. Status of figure: December 2018 png 223kB, pdf 22kB, eps 24kB This and previous plot versions
Exclusion limits at 95% CL based on 8 and 13 !TeV data in the (squark, lightest neutralino) mass plane for different simplified models featuring the decay of squarks to the lightest supersymmetric particle (lightest neutralino or gravitino) either directly or through a cascade chain featuring other SUSY particles with intermediate masses. For each line, the squark decay mode is reported in the legend and it is assumed to proceed with 100% branching ratio. Some limits depend on additional assumptions on the mass of the intermediate states, as described in the references provided in the plot. Status of figure: March 2018 png 186kB, pdf 19kB This and previous plot versions
Mass reach of the ATLAS searches for Supersymmetry. A representative selection of the available search results is shown. Results are quoted for the nominal cross section in both a region of near-maximal mass reach and a demonstrative alternative scenario, in order to display the range in model space of search sensitivity. Some limits depend on additional assumptions on the mass of the intermediate states, as described in the references provided in the plot. In some cases these additional dependencies are indicated by darker bands showing different model parameters. Status of figure: March 2019 png 724kB, pdf 48kB This and previous plot versions

Outdated versions of summary plots

ATLAS Collaboration, 2019