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| CMS-SUS-23-003 ; CERN-EP-2025-154 | ||
| A general search for supersymmetric particles in scenarios with compressed mass spectra using proton-proton collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 19 August 2025 | ||
| Accepted for publication in Phys. Rev. D | ||
| Abstract: A general search is presented for supersymmetric particles (sparticles) in scenarios featuring compressed mass spectra using proton-proton collisions at a center-of-mass energy of 13 TeV, recorded with the CMS detector at the LHC. The analyzed data sample corresponds to an integrated luminosity of 138 fb$ ^{-1} $. A wide range of potential sparticle signatures are targeted, including pair production of electroweakinos, sleptons, and top squarks. The search focuses on events with a high transverse momentum system from initial-state-radiation jets recoiling against a potential sparticle system with significant missing transverse momentum. Events are categorized based on their lepton multiplicity, jet multiplicity, number of b-tagged jets, and kinematic variables sensitive to the sparticle masses and mass splittings. The sensitivity extends to higher parent sparticle masses than previously probed at the LHC for production of pairs of electroweakinos, sleptons, and top squarks with mass spectra featuring small mass splittings (compressed mass spectra). The observed results demonstrate agreement with the predictions of the background-only model. Lower mass limits are set at 95% confidence level on production of pairs of electroweakinos, sleptons, and top squarks that extend to 325, 275, and 780 GeV, respectively, for the most favorable compressed mass regime cases. | ||
| Links: e-print arXiv:2508.13900 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Diagrams for top squark pair production. The left panel shows the T2tt model with decay via top quarks and the right panel illustrates the four-body phase space used in modeling the most compressed region. |
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Figure 1-a:
Diagrams for top squark pair production. The left panel shows the T2tt model with decay via top quarks and the right panel illustrates the four-body phase space used in modeling the most compressed region. |
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Figure 1-b:
Diagrams for top squark pair production. The left panel shows the T2tt model with decay via top quarks and the right panel illustrates the four-body phase space used in modeling the most compressed region. |
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Figure 2:
Diagrams for top squark pair production. The left panel shows the T2bW model with decay via an intermediate mass chargino and the right panel shows the T2cc model with decay via charm quarks. |
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Figure 2-a:
Diagrams for top squark pair production. The left panel shows the T2bW model with decay via an intermediate mass chargino and the right panel shows the T2cc model with decay via charm quarks. |
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Figure 2-b:
Diagrams for top squark pair production. The left panel shows the T2bW model with decay via an intermediate mass chargino and the right panel shows the T2cc model with decay via charm quarks. |
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Figure 3:
Diagrams for electroweakino production. The left panel shows associated production of the lightest chargino and second-lightest neutralino ($ \tilde{\chi}_{1}^{\pm}\tilde{\chi}_{2}^{0} $) in the TChiWZ model and the right panel shows pair production of the lightest chargino ($ \tilde{\chi}_{1}^{+}\tilde{\chi}_{1}^{-} $) in the TChiWW model. |
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Figure 3-a:
Diagrams for electroweakino production. The left panel shows associated production of the lightest chargino and second-lightest neutralino ($ \tilde{\chi}_{1}^{\pm}\tilde{\chi}_{2}^{0} $) in the TChiWZ model and the right panel shows pair production of the lightest chargino ($ \tilde{\chi}_{1}^{+}\tilde{\chi}_{1}^{-} $) in the TChiWW model. |
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Figure 3-b:
Diagrams for electroweakino production. The left panel shows associated production of the lightest chargino and second-lightest neutralino ($ \tilde{\chi}_{1}^{\pm}\tilde{\chi}_{2}^{0} $) in the TChiWZ model and the right panel shows pair production of the lightest chargino ($ \tilde{\chi}_{1}^{+}\tilde{\chi}_{1}^{-} $) in the TChiWW model. |
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Figure 4:
Diagrams for pair production of charged sleptons with subsequent decay to $ \ell^{\pm}\tilde{\chi}_{1}^{0} $ where $ \ell = \mathrm{e},\mu $. |
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Figure 4-a:
Diagrams for pair production of charged sleptons with subsequent decay to $ \ell^{\pm}\tilde{\chi}_{1}^{0} $ where $ \ell = \mathrm{e},\mu $. |
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Figure 4-b:
Diagrams for pair production of charged sleptons with subsequent decay to $ \ell^{\pm}\tilde{\chi}_{1}^{0} $ where $ \ell = \mathrm{e},\mu $. |
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Figure 5:
Diagrams for pair production of the lightest chargino with subsequent leptonic decays via an intermediate mass charged slepton or sneutrino, where $ \ell = \mathrm{e},\mu,\tau $. In addition to the illustrated diagrams, the other two combinations where either both charginos decay to an intermediate charged slepton or both charginos decay to an intermediate sneutrino are also included in this TChiSlepSnu model. |
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Figure 5-a:
Diagrams for pair production of the lightest chargino with subsequent leptonic decays via an intermediate mass charged slepton or sneutrino, where $ \ell = \mathrm{e},\mu,\tau $. In addition to the illustrated diagrams, the other two combinations where either both charginos decay to an intermediate charged slepton or both charginos decay to an intermediate sneutrino are also included in this TChiSlepSnu model. |
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Figure 5-b:
Diagrams for pair production of the lightest chargino with subsequent leptonic decays via an intermediate mass charged slepton or sneutrino, where $ \ell = \mathrm{e},\mu,\tau $. In addition to the illustrated diagrams, the other two combinations where either both charginos decay to an intermediate charged slepton or both charginos decay to an intermediate sneutrino are also included in this TChiSlepSnu model. |
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Figure 6:
Efficiencies of lepton candidates satisfying baseline requirements to be identified in the gold, silver, and bronze categories for prompt leptons (solid circles) and misidentified leptons (open squares), evaluated in simulated $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ events. Electrons (muons) are shown in the left (right) panel. As the three categories are mutually exclusive and exhaustive for baseline leptons, these efficiencies sum to one for each source in each lepton $ p_{\mathrm{T}} $ bin. |
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Figure 6-a:
Efficiencies of lepton candidates satisfying baseline requirements to be identified in the gold, silver, and bronze categories for prompt leptons (solid circles) and misidentified leptons (open squares), evaluated in simulated $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ events. Electrons (muons) are shown in the left (right) panel. As the three categories are mutually exclusive and exhaustive for baseline leptons, these efficiencies sum to one for each source in each lepton $ p_{\mathrm{T}} $ bin. |
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Figure 6-b:
Efficiencies of lepton candidates satisfying baseline requirements to be identified in the gold, silver, and bronze categories for prompt leptons (solid circles) and misidentified leptons (open squares), evaluated in simulated $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ events. Electrons (muons) are shown in the left (right) panel. As the three categories are mutually exclusive and exhaustive for baseline leptons, these efficiencies sum to one for each source in each lepton $ p_{\mathrm{T}} $ bin. |
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Figure 7:
Distributions of the b, c, and light-quark SV tagging efficiencies, as functions of the SV candidate $ p_{\mathrm{T}} $, for the chosen working point. The SV flavor identities are determined from the generator-level flavor information and $ \Delta R $ matching to SV candidates. |
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Figure 8:
Decay tree diagram used to analyze events. Here S represents the total system of candidate sparticles, with P$_{\mathrm{a/b}}$ representing pair-produced SUSY parent particles; I$_{\mathrm{a/b}}$ and V$_{\mathrm{a/b}}$ represent the systems of invisible and visible sparticle decay products, respectively. The S system, along with the recoiling ISR system, are viewed as decay products of the entire center-of-mass (CM) system of the colliding partons with constituent center-of-mass energy, $ \sqrt{\hat{s}} $. |
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Figure 9:
Distributions of $ R_{\mathrm{ISR}} $ for simulated events in the 2 lepton final state for TChiWZ signal models with 250 GeV parent mass and various LSP masses ranging from 160 to 245 GeV (left) and the SM backgrounds (right). |
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Figure 9-a:
Distributions of $ R_{\mathrm{ISR}} $ for simulated events in the 2 lepton final state for TChiWZ signal models with 250 GeV parent mass and various LSP masses ranging from 160 to 245 GeV (left) and the SM backgrounds (right). |
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Figure 9-b:
Distributions of $ R_{\mathrm{ISR}} $ for simulated events in the 2 lepton final state for TChiWZ signal models with 250 GeV parent mass and various LSP masses ranging from 160 to 245 GeV (left) and the SM backgrounds (right). |
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Figure 10:
Distributions of $ p_{\mathrm{T}}^{\mkern3mu\mathrm{ISR}} $ vs. $ R_{\mathrm{ISR}} $ in events with 0 leptons for simulated top squark signals in the T2tt model with parent mass of 500 GeV and a LSP mass of 400 GeV (left), LSP mass of 480 GeV (center), and $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background (right). |
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Figure 10-a:
Distributions of $ p_{\mathrm{T}}^{\mkern3mu\mathrm{ISR}} $ vs. $ R_{\mathrm{ISR}} $ in events with 0 leptons for simulated top squark signals in the T2tt model with parent mass of 500 GeV and a LSP mass of 400 GeV (left), LSP mass of 480 GeV (center), and $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background (right). |
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Figure 10-b:
Distributions of $ p_{\mathrm{T}}^{\mkern3mu\mathrm{ISR}} $ vs. $ R_{\mathrm{ISR}} $ in events with 0 leptons for simulated top squark signals in the T2tt model with parent mass of 500 GeV and a LSP mass of 400 GeV (left), LSP mass of 480 GeV (center), and $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background (right). |
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Figure 10-c:
Distributions of $ p_{\mathrm{T}}^{\mkern3mu\mathrm{ISR}} $ vs. $ R_{\mathrm{ISR}} $ in events with 0 leptons for simulated top squark signals in the T2tt model with parent mass of 500 GeV and a LSP mass of 400 GeV (left), LSP mass of 480 GeV (center), and $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background (right). |
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Figure 11:
Distributions of $ M_{\perp} $ in one lepton final states for simulated events: compressed T2tt signal events with a parent top squark mass of 500 GeV and LSP masses ranging from 325 to 480 GeV (left) and the SM backgrounds (right). |
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Figure 11-a:
Distributions of $ M_{\perp} $ in one lepton final states for simulated events: compressed T2tt signal events with a parent top squark mass of 500 GeV and LSP masses ranging from 325 to 480 GeV (left) and the SM backgrounds (right). |
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Figure 11-b:
Distributions of $ M_{\perp} $ in one lepton final states for simulated events: compressed T2tt signal events with a parent top squark mass of 500 GeV and LSP masses ranging from 325 to 480 GeV (left) and the SM backgrounds (right). |
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Figure 12:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for simulated events in multiple final states. (Upper row) $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background events in 0 lepton (0L), one lepton (1L), and two lepton (2L) final states. (Middle row) T2tt signals in 0L final states and (lower row) TChiWZ signals in 2L final states for various sparticle mass combinations. |
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Figure 12-a:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for simulated events in multiple final states. (Upper row) $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background events in 0 lepton (0L), one lepton (1L), and two lepton (2L) final states. (Middle row) T2tt signals in 0L final states and (lower row) TChiWZ signals in 2L final states for various sparticle mass combinations. |
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Figure 12-b:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for simulated events in multiple final states. (Upper row) $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background events in 0 lepton (0L), one lepton (1L), and two lepton (2L) final states. (Middle row) T2tt signals in 0L final states and (lower row) TChiWZ signals in 2L final states for various sparticle mass combinations. |
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Figure 12-c:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for simulated events in multiple final states. (Upper row) $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background events in 0 lepton (0L), one lepton (1L), and two lepton (2L) final states. (Middle row) T2tt signals in 0L final states and (lower row) TChiWZ signals in 2L final states for various sparticle mass combinations. |
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Figure 12-d:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for simulated events in multiple final states. (Upper row) $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background events in 0 lepton (0L), one lepton (1L), and two lepton (2L) final states. (Middle row) T2tt signals in 0L final states and (lower row) TChiWZ signals in 2L final states for various sparticle mass combinations. |
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Figure 12-e:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for simulated events in multiple final states. (Upper row) $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background events in 0 lepton (0L), one lepton (1L), and two lepton (2L) final states. (Middle row) T2tt signals in 0L final states and (lower row) TChiWZ signals in 2L final states for various sparticle mass combinations. |
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Figure 12-f:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for simulated events in multiple final states. (Upper row) $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background events in 0 lepton (0L), one lepton (1L), and two lepton (2L) final states. (Middle row) T2tt signals in 0L final states and (lower row) TChiWZ signals in 2L final states for various sparticle mass combinations. |
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Figure 12-g:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for simulated events in multiple final states. (Upper row) $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background events in 0 lepton (0L), one lepton (1L), and two lepton (2L) final states. (Middle row) T2tt signals in 0L final states and (lower row) TChiWZ signals in 2L final states for various sparticle mass combinations. |
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Figure 12-h:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for simulated events in multiple final states. (Upper row) $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background events in 0 lepton (0L), one lepton (1L), and two lepton (2L) final states. (Middle row) T2tt signals in 0L final states and (lower row) TChiWZ signals in 2L final states for various sparticle mass combinations. |
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Figure 12-i:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for simulated events in multiple final states. (Upper row) $ {\mathrm{t}\overline{\mathrm{t}}}+\text{jets} $ background events in 0 lepton (0L), one lepton (1L), and two lepton (2L) final states. (Middle row) T2tt signals in 0L final states and (lower row) TChiWZ signals in 2L final states for various sparticle mass combinations. |
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Figure 13:
Distributions of $ \text{max} \: |\eta_{\mathrm{SV}}^{\mathrm{S}}| $ in final states with 0 leptons and $ {\geq} $ 1 SVs associated with the S system, for simulated SM background events (left) and various top squark signal models (right). |
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Figure 13-a:
Distributions of $ \text{max} \: |\eta_{\mathrm{SV}}^{\mathrm{S}}| $ in final states with 0 leptons and $ {\geq} $ 1 SVs associated with the S system, for simulated SM background events (left) and various top squark signal models (right). |
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Figure 13-b:
Distributions of $ \text{max} \: |\eta_{\mathrm{SV}}^{\mathrm{S}}| $ in final states with 0 leptons and $ {\geq} $ 1 SVs associated with the S system, for simulated SM background events (left) and various top squark signal models (right). |
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Figure 14:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for a TChiWZ signal sample with a parent mass of 300 GeV and a LSP mass of 290 GeV (left) and the corresponding total SM background (right) for the 2L, 0 S-jet category. The dashed lines show the bin edges for this particular jet multiplicity. |
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Figure 14-a:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for a TChiWZ signal sample with a parent mass of 300 GeV and a LSP mass of 290 GeV (left) and the corresponding total SM background (right) for the 2L, 0 S-jet category. The dashed lines show the bin edges for this particular jet multiplicity. |
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Figure 14-b:
Distributions of $ R_{\mathrm{ISR}} $ vs. $ M_{\perp} $ for a TChiWZ signal sample with a parent mass of 300 GeV and a LSP mass of 290 GeV (left) and the corresponding total SM background (right) for the 2L, 0 S-jet category. The dashed lines show the bin edges for this particular jet multiplicity. |
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Figure 15:
Distribution of post-fit z-scores for the full data set background-only fit. The superimposed Gaussian model uses the observed mean and standard deviation. |
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Figure 16:
Post-fit distributions of data with the background-only fit model for the full data set in the 0L region (upper) and 1L region (lower). Bins are split by $ R_{\mathrm{ISR}} $ along with $ N_{\text{jet}}^{\mathrm{S}} $. Yields are integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. |
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Figure 16-a:
Post-fit distributions of data with the background-only fit model for the full data set in the 0L region (upper) and 1L region (lower). Bins are split by $ R_{\mathrm{ISR}} $ along with $ N_{\text{jet}}^{\mathrm{S}} $. Yields are integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. |
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Figure 16-b:
Post-fit distributions of data with the background-only fit model for the full data set in the 0L region (upper) and 1L region (lower). Bins are split by $ R_{\mathrm{ISR}} $ along with $ N_{\text{jet}}^{\mathrm{S}} $. Yields are integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. |
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Figure 17:
Post-fit distributions of data with the background-only fit model for the full data set in the 2L region (upper) and 3L region (lower). Bins are split by $ R_{\mathrm{ISR}} $ along with lepton categorization. Yields are integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. |
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Figure 17-a:
Post-fit distributions of data with the background-only fit model for the full data set in the 2L region (upper) and 3L region (lower). Bins are split by $ R_{\mathrm{ISR}} $ along with lepton categorization. Yields are integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. |
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Figure 17-b:
Post-fit distributions of data with the background-only fit model for the full data set in the 2L region (upper) and 3L region (lower). Bins are split by $ R_{\mathrm{ISR}} $ along with lepton categorization. Yields are integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. |
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Figure 18:
Post-fit distributions of data with the background-only fit model for the full data set. (Upper) 0L and 1L gold regions with larger jet multiplicities. (Lower) 0L 5J regions separated by $ b $-tagged jet multiplicities in the S and ISR systems. Bins are split by $ R_{\mathrm{ISR}} $ with yields integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. Expected yields for example signal models are superimposed. |
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Figure 18-a:
Post-fit distributions of data with the background-only fit model for the full data set. (Upper) 0L and 1L gold regions with larger jet multiplicities. (Lower) 0L 5J regions separated by $ b $-tagged jet multiplicities in the S and ISR systems. Bins are split by $ R_{\mathrm{ISR}} $ with yields integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. Expected yields for example signal models are superimposed. |
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Figure 18-b:
Post-fit distributions of data with the background-only fit model for the full data set. (Upper) 0L and 1L gold regions with larger jet multiplicities. (Lower) 0L 5J regions separated by $ b $-tagged jet multiplicities in the S and ISR systems. Bins are split by $ R_{\mathrm{ISR}} $ with yields integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. Expected yields for example signal models are superimposed. |
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Figure 19:
Post-fit distributions of data with the background-only model for the full data set. (Upper) 2L 0J gold regions separated by lepton flavor and charge. (Lower) Central b-tagged SV regions in 0L, 1L, and 2L final states. Bins are split by $ R_{\mathrm{ISR}} $ with yields integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. Expected yields for example signal models are superimposed. |
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Figure 19-a:
Post-fit distributions of data with the background-only model for the full data set. (Upper) 2L 0J gold regions separated by lepton flavor and charge. (Lower) Central b-tagged SV regions in 0L, 1L, and 2L final states. Bins are split by $ R_{\mathrm{ISR}} $ with yields integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. Expected yields for example signal models are superimposed. |
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Figure 19-b:
Post-fit distributions of data with the background-only model for the full data set. (Upper) 2L 0J gold regions separated by lepton flavor and charge. (Lower) Central b-tagged SV regions in 0L, 1L, and 2L final states. Bins are split by $ R_{\mathrm{ISR}} $ with yields integrated over all other sub-categorizations and $ M_{\perp} $. The sub-panels below the panels show the data minus fit model scaled by the post-fit model uncertainty. Expected yields for example signal models are superimposed. |
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Figure 20:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 0L 0J and 1J regions. (Lower) 0L 2J and 3J regions. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 20-a:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 0L 0J and 1J regions. (Lower) 0L 2J and 3J regions. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 20-b:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 0L 0J and 1J regions. (Lower) 0L 2J and 3J regions. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 21:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 0L 4J and $ \ge $5J regions. (Lower) 1L 0J regions with a gold lepton. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 21-a:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 0L 4J and $ \ge $5J regions. (Lower) 1L 0J regions with a gold lepton. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 21-b:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 0L 4J and $ \ge $5J regions. (Lower) 1L 0J regions with a gold lepton. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 22:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 1L 1J and 2J regions with a gold lepton. (Lower) 1L 3J and $ \ge $4J regions with a gold lepton. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 22-a:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 1L 1J and 2J regions with a gold lepton. (Lower) 1L 3J and $ \ge $4J regions with a gold lepton. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 22-b:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 1L 1J and 2J regions with a gold lepton. (Lower) 1L 3J and $ \ge $4J regions with a gold lepton. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 23:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category of the 2L 0J regions with gold leptons. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 24:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 2L 1J regions with gold leptons. (Lower) 2L $ \ge $2J regions with gold leptons. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 24-a:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 2L 1J regions with gold leptons. (Lower) 2L $ \ge $2J regions with gold leptons. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 24-b:
Post-fit distributions of data with the background-only model for the full data set for the highest $ R_{\mathrm{ISR}} $ bin in each analysis category. (Upper) 2L 1J regions with gold leptons. (Lower) 2L $ \ge $2J regions with gold leptons. The sub-panels below the panels indicate the post-fit z-score for each bin. |
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Figure 25:
Top squark pair production. Observed upper limits at 95% CL on the product of the cross section and relevant branching fractions are shown using the color scale where the $ \tilde{\mathrm{t}} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\mathrm{t}} $ and the LSP is on the $ y $-axis. The expected lower mass limits (magenta line) together with their $ \pm 1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions. The left panel shows the results for the T2tt model with limits on $ \sigma (\tilde{\mathrm{t}} \overline{\tilde{\mathrm{t}}}) \mathcal{B}^{2} (\tilde{\mathrm{t}} \to \mathrm{t} \tilde{\chi}_{1}^{0}) $. The right panel shows the results for the T2bW model with limits on $ \sigma (\tilde{\mathrm{t}} \overline{\tilde{\mathrm{t}}}) \mathcal{B}^{2} (\tilde{\mathrm{t}} \to \mathrm{b} \tilde{\chi}_{1}^{+}) \mathcal{B}^{2} ( \tilde{\chi}_{1}^{+}\to\mathrm{W^+} \tilde{\chi}_{1}^{0} ) $. |
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Figure 25-a:
Top squark pair production. Observed upper limits at 95% CL on the product of the cross section and relevant branching fractions are shown using the color scale where the $ \tilde{\mathrm{t}} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\mathrm{t}} $ and the LSP is on the $ y $-axis. The expected lower mass limits (magenta line) together with their $ \pm 1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions. The left panel shows the results for the T2tt model with limits on $ \sigma (\tilde{\mathrm{t}} \overline{\tilde{\mathrm{t}}}) \mathcal{B}^{2} (\tilde{\mathrm{t}} \to \mathrm{t} \tilde{\chi}_{1}^{0}) $. The right panel shows the results for the T2bW model with limits on $ \sigma (\tilde{\mathrm{t}} \overline{\tilde{\mathrm{t}}}) \mathcal{B}^{2} (\tilde{\mathrm{t}} \to \mathrm{b} \tilde{\chi}_{1}^{+}) \mathcal{B}^{2} ( \tilde{\chi}_{1}^{+}\to\mathrm{W^+} \tilde{\chi}_{1}^{0} ) $. |
png pdf |
Figure 25-b:
Top squark pair production. Observed upper limits at 95% CL on the product of the cross section and relevant branching fractions are shown using the color scale where the $ \tilde{\mathrm{t}} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\mathrm{t}} $ and the LSP is on the $ y $-axis. The expected lower mass limits (magenta line) together with their $ \pm 1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions. The left panel shows the results for the T2tt model with limits on $ \sigma (\tilde{\mathrm{t}} \overline{\tilde{\mathrm{t}}}) \mathcal{B}^{2} (\tilde{\mathrm{t}} \to \mathrm{t} \tilde{\chi}_{1}^{0}) $. The right panel shows the results for the T2bW model with limits on $ \sigma (\tilde{\mathrm{t}} \overline{\tilde{\mathrm{t}}}) \mathcal{B}^{2} (\tilde{\mathrm{t}} \to \mathrm{b} \tilde{\chi}_{1}^{+}) \mathcal{B}^{2} ( \tilde{\chi}_{1}^{+}\to\mathrm{W^+} \tilde{\chi}_{1}^{0} ) $. |
png pdf |
Figure 26:
Top squark pair production. Observed upper limits at 95% CL on the product of the cross section and branching fraction squared, $ \sigma (\tilde{\mathrm{t}} \overline{\tilde{\mathrm{t}}}) \mathcal{B}^{2} (\tilde{\mathrm{t}}\to\mathrm{c} \tilde{\chi}_{1}^{0} ) $ (left), are shown using the color scale where the $ \tilde{\mathrm{t}} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\mathrm{t}} $ and the LSP is on the $ y $-axis. The expected lower mass limits (magenta line) together with their $ \pm 1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions. Observed and median expected limits for top squark pair production at 95% CL (right) for the three decay modes investigated. |
png pdf |
Figure 26-a:
Top squark pair production. Observed upper limits at 95% CL on the product of the cross section and branching fraction squared, $ \sigma (\tilde{\mathrm{t}} \overline{\tilde{\mathrm{t}}}) \mathcal{B}^{2} (\tilde{\mathrm{t}}\to\mathrm{c} \tilde{\chi}_{1}^{0} ) $ (left), are shown using the color scale where the $ \tilde{\mathrm{t}} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\mathrm{t}} $ and the LSP is on the $ y $-axis. The expected lower mass limits (magenta line) together with their $ \pm 1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions. Observed and median expected limits for top squark pair production at 95% CL (right) for the three decay modes investigated. |
png pdf |
Figure 26-b:
Top squark pair production. Observed upper limits at 95% CL on the product of the cross section and branching fraction squared, $ \sigma (\tilde{\mathrm{t}} \overline{\tilde{\mathrm{t}}}) \mathcal{B}^{2} (\tilde{\mathrm{t}}\to\mathrm{c} \tilde{\chi}_{1}^{0} ) $ (left), are shown using the color scale where the $ \tilde{\mathrm{t}} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\mathrm{t}} $ and the LSP is on the $ y $-axis. The expected lower mass limits (magenta line) together with their $ \pm 1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions. Observed and median expected limits for top squark pair production at 95% CL (right) for the three decay modes investigated. |
png pdf |
Figure 27:
Chargino-neutralino production. Observed upper limits at 95% CL on the product of the cross section and the two branching fractions, $ \sigma (\tilde{\chi}_{1}^{\pm} \tilde{\chi}_{2}^{0}) \mathcal{B} ( \tilde{\chi}_{1}^{\pm} \to \mathrm{W}^{\pm} \tilde{\chi}_{1}^{0} ) \mathcal{B} ( \tilde{\chi}_{2}^{0} \to \mathrm{Z} \tilde{\chi}_{1}^{0} ) $, are shown using the color scale where the $ \tilde{\chi}_{1}^{\pm}/\tilde{\chi}_{2}^{0} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\chi}_{1}^{\pm}/\tilde{\chi}_{2}^{0} $ and the LSP is on the $ y $-axis. For these results, based on the TChiWZ simplified model, the $ \tilde{\chi}_{1}^{\pm} $ and $ \tilde{\chi}_{2}^{0} $ masses are set equal. The expected lower mass limits (magenta line) together with their $ \pm 1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions for wino-like cross-sections (left) and for higgsino-like cross-sections (right). |
png pdf |
Figure 27-a:
Chargino-neutralino production. Observed upper limits at 95% CL on the product of the cross section and the two branching fractions, $ \sigma (\tilde{\chi}_{1}^{\pm} \tilde{\chi}_{2}^{0}) \mathcal{B} ( \tilde{\chi}_{1}^{\pm} \to \mathrm{W}^{\pm} \tilde{\chi}_{1}^{0} ) \mathcal{B} ( \tilde{\chi}_{2}^{0} \to \mathrm{Z} \tilde{\chi}_{1}^{0} ) $, are shown using the color scale where the $ \tilde{\chi}_{1}^{\pm}/\tilde{\chi}_{2}^{0} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\chi}_{1}^{\pm}/\tilde{\chi}_{2}^{0} $ and the LSP is on the $ y $-axis. For these results, based on the TChiWZ simplified model, the $ \tilde{\chi}_{1}^{\pm} $ and $ \tilde{\chi}_{2}^{0} $ masses are set equal. The expected lower mass limits (magenta line) together with their $ \pm 1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions for wino-like cross-sections (left) and for higgsino-like cross-sections (right). |
png pdf |
Figure 27-b:
Chargino-neutralino production. Observed upper limits at 95% CL on the product of the cross section and the two branching fractions, $ \sigma (\tilde{\chi}_{1}^{\pm} \tilde{\chi}_{2}^{0}) \mathcal{B} ( \tilde{\chi}_{1}^{\pm} \to \mathrm{W}^{\pm} \tilde{\chi}_{1}^{0} ) \mathcal{B} ( \tilde{\chi}_{2}^{0} \to \mathrm{Z} \tilde{\chi}_{1}^{0} ) $, are shown using the color scale where the $ \tilde{\chi}_{1}^{\pm}/\tilde{\chi}_{2}^{0} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\chi}_{1}^{\pm}/\tilde{\chi}_{2}^{0} $ and the LSP is on the $ y $-axis. For these results, based on the TChiWZ simplified model, the $ \tilde{\chi}_{1}^{\pm} $ and $ \tilde{\chi}_{2}^{0} $ masses are set equal. The expected lower mass limits (magenta line) together with their $ \pm 1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions for wino-like cross-sections (left) and for higgsino-like cross-sections (right). |
png pdf |
Figure 28:
Chargino pair production. The left panel shows the observed upper limits at 95% CL on the product of the cross section and the branching fraction squared, $ \sigma (\tilde{\chi}_{1}^{+} \tilde{\chi}_{1}^{-}) \mathcal{B}^{2} ( \tilde{\chi}_{1}^{\pm} \to \mathrm{W}^{\pm} \tilde{\chi}_{1}^{0} ) $ are shown using the color scale where the $ \tilde{\chi}_{1}^{\pm} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\chi}_{1}^{\pm} $ and the LSP is on the $ y $-axis. The expected lower mass limits (magenta line) together with their $ {\pm}1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions for wino-like cross-sections. The right panel shows the results for chargino pair production with decays as in the TChiSlepSnu model with democratic decay via an intermediate sneutrino or charged slepton ({\HepSusyParticle\ellL\pm} ) with mass halfway between the chargino and the lightest neutralino. These model predictions also assume wino-like cross sections. |
png pdf |
Figure 28-a:
Chargino pair production. The left panel shows the observed upper limits at 95% CL on the product of the cross section and the branching fraction squared, $ \sigma (\tilde{\chi}_{1}^{+} \tilde{\chi}_{1}^{-}) \mathcal{B}^{2} ( \tilde{\chi}_{1}^{\pm} \to \mathrm{W}^{\pm} \tilde{\chi}_{1}^{0} ) $ are shown using the color scale where the $ \tilde{\chi}_{1}^{\pm} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\chi}_{1}^{\pm} $ and the LSP is on the $ y $-axis. The expected lower mass limits (magenta line) together with their $ {\pm}1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions for wino-like cross-sections. The right panel shows the results for chargino pair production with decays as in the TChiSlepSnu model with democratic decay via an intermediate sneutrino or charged slepton ({\HepSusyParticle\ellL\pm} ) with mass halfway between the chargino and the lightest neutralino. These model predictions also assume wino-like cross sections. |
png pdf |
Figure 28-b:
Chargino pair production. The left panel shows the observed upper limits at 95% CL on the product of the cross section and the branching fraction squared, $ \sigma (\tilde{\chi}_{1}^{+} \tilde{\chi}_{1}^{-}) \mathcal{B}^{2} ( \tilde{\chi}_{1}^{\pm} \to \mathrm{W}^{\pm} \tilde{\chi}_{1}^{0} ) $ are shown using the color scale where the $ \tilde{\chi}_{1}^{\pm} $ mass is on the $ x $-axis and the mass difference between the $ \tilde{\chi}_{1}^{\pm} $ and the LSP is on the $ y $-axis. The expected lower mass limits (magenta line) together with their $ {\pm}1\sigma $ uncertainties (magenta dashed lines) and the observed lower mass limits (black line) are indicated for 100% branching fractions for wino-like cross-sections. The right panel shows the results for chargino pair production with decays as in the TChiSlepSnu model with democratic decay via an intermediate sneutrino or charged slepton ({\HepSusyParticle\ellL\pm} ) with mass halfway between the chargino and the lightest neutralino. These model predictions also assume wino-like cross sections. |
png pdf |
Figure 29:
Summary of the model exclusion results on chargino-neutralino production and chargino pair production. Solid lines are 95% CL observed limits and dashed lines are the corresponding median expected limits. The left panel shows the results for mass differences exceeding 50 GeV and the right panel for mass differences below 50 GeV. |
png pdf |
Figure 29-a:
Summary of the model exclusion results on chargino-neutralino production and chargino pair production. Solid lines are 95% CL observed limits and dashed lines are the corresponding median expected limits. The left panel shows the results for mass differences exceeding 50 GeV and the right panel for mass differences below 50 GeV. |
png pdf |
Figure 29-b:
Summary of the model exclusion results on chargino-neutralino production and chargino pair production. Solid lines are 95% CL observed limits and dashed lines are the corresponding median expected limits. The left panel shows the results for mass differences exceeding 50 GeV and the right panel for mass differences below 50 GeV. |
png pdf |
Figure 30:
Slepton pair production. Observed 95% CL upper limits on the product of the cross section and branching fraction squared for direct slepton pair production followed by decay of both sleptons to the corresponding lepton and neutralino (color scale). Slepton $ \tilde{\ell}_{\mathrm{L}/\mathrm{R}} $ indicates the scalar supersymmetric partner of left- and right-handed electrons and muons. The limit is shown as a function of the slepton mass and the mass difference between the slepton and the lightest neutralino. The regions to the left of the lines denote the regions excluded for a branching fraction of 100%. The median expected exclusion regions for 100% branching fraction are delimited by the dashed lines. |
png pdf |
Figure 31:
Slepton pair production. Observed 95% CL upper limits on the cross section times branching fraction squared for direct selectron pair production (left) and smuon pair production (right) followed by decay of both sleptons to the corresponding lepton and neutralino (color scale). The limits are shown as a function of the slepton mass and the mass difference between the slepton and the lightest neutralino for the three different simplified possibilities of only RR, only LL, and both RR and LL where it is assumed that the R and L masses are identical. The regions to the left of the lines denote the regions excluded for a branching fraction of 100%. Median expected limits for 100% branching fraction are delimited by the dashed lines. |
png pdf |
Figure 31-a:
Slepton pair production. Observed 95% CL upper limits on the cross section times branching fraction squared for direct selectron pair production (left) and smuon pair production (right) followed by decay of both sleptons to the corresponding lepton and neutralino (color scale). The limits are shown as a function of the slepton mass and the mass difference between the slepton and the lightest neutralino for the three different simplified possibilities of only RR, only LL, and both RR and LL where it is assumed that the R and L masses are identical. The regions to the left of the lines denote the regions excluded for a branching fraction of 100%. Median expected limits for 100% branching fraction are delimited by the dashed lines. |
png pdf |
Figure 31-b:
Slepton pair production. Observed 95% CL upper limits on the cross section times branching fraction squared for direct selectron pair production (left) and smuon pair production (right) followed by decay of both sleptons to the corresponding lepton and neutralino (color scale). The limits are shown as a function of the slepton mass and the mass difference between the slepton and the lightest neutralino for the three different simplified possibilities of only RR, only LL, and both RR and LL where it is assumed that the R and L masses are identical. The regions to the left of the lines denote the regions excluded for a branching fraction of 100%. Median expected limits for 100% branching fraction are delimited by the dashed lines. |
png pdf |
Figure 32:
Slepton pair production. Observed and median expected limits for direct slepton pair production at 95% CL. Slepton $ \tilde{\ell}_{\mathrm{L}/\mathrm{R}} $ indicates the scalar supersymmetric partner of left- and right-handed electrons and muons. The limit is shown as a function of the slepton mass and the mass difference between the slepton and the lightest neutralino. The corresponding selectron only and smuon only results of Fig. 31 are shown too assuming a 100% branching fraction. |
png pdf |
Figure 33:
Slepton pair production. Observed 95% CL exclusion regions for direct pair production of the superpartners of the left-handed leptons (left) and direct pair production of the superpartners of the right-handed leptons (right) followed by decay of both sleptons to the corresponding lepton and neutralino with 100% branching fraction. The limits are shown as a function of the slepton mass and the mass difference between the slepton and the lightest neutralino. The regions to the left of the lines denote the excluded regions. Median expected limits are displayed with dashed lines. |
png pdf |
Figure 33-a:
Slepton pair production. Observed 95% CL exclusion regions for direct pair production of the superpartners of the left-handed leptons (left) and direct pair production of the superpartners of the right-handed leptons (right) followed by decay of both sleptons to the corresponding lepton and neutralino with 100% branching fraction. The limits are shown as a function of the slepton mass and the mass difference between the slepton and the lightest neutralino. The regions to the left of the lines denote the excluded regions. Median expected limits are displayed with dashed lines. |
png pdf |
Figure 33-b:
Slepton pair production. Observed 95% CL exclusion regions for direct pair production of the superpartners of the left-handed leptons (left) and direct pair production of the superpartners of the right-handed leptons (right) followed by decay of both sleptons to the corresponding lepton and neutralino with 100% branching fraction. The limits are shown as a function of the slepton mass and the mass difference between the slepton and the lightest neutralino. The regions to the left of the lines denote the excluded regions. Median expected limits are displayed with dashed lines. |
| Tables | |
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Table 1:
Category definitions for 0L regions for each $ N_{\text{jet}}^{\mathrm{S}} $ multiplicity. The highest (5J) is inclusive ($ N_{\text{jet}}^{\mathrm{S}} \geq $ 5). There are 84 exclusive categories in total for the 0L regions. |
png pdf |
Table 2:
The $ R_{\mathrm{ISR}} $ and $ M_{\perp} $ bin definitions for 0L regions for each $ N_{\text{jet}}^{\mathrm{S}} $ multiplicity. The highest (5J) is inclusive ($ N_{\text{jet}}^{\mathrm{S}} \geq $ 5). The lower $ R_{\mathrm{ISR}} $ bins denoted as "CR" are used as control regions. |
png pdf |
Table 3:
Category definitions for 1L regions for each $ N_{\text{jet}}^{\mathrm{S}} $ multiplicity. The highest (4J) is inclusive ($ N_{\text{jet}}^{\mathrm{S}} \geq $ 4). There are a total of 178 categories for the 1L regions. |
png pdf |
Table 4:
The $ R_{\mathrm{ISR}} $ and $ M_{\perp} $ bin definitions for 1L regions for each $ N_{\text{jet}}^{\mathrm{S}} $ multiplicity. The highest (4J) is inclusive ($ N_{\text{jet}}^{\mathrm{S}} \geq $ 4). The lower $ R_{\mathrm{ISR}} $ bins denoted as "CR" are used as control regions. |
png pdf |
Table 5:
Category definitions for 2L regions for each $ N_{\text{jet}}^{\mathrm{S}} $ multiplicity. The highest (2J) is inclusive ($ N_{\text{jet}}^{\mathrm{S}} \geq $ 2). There is a total of 115 exclusive 2L categories. |
png pdf |
Table 6:
The $ R_{\mathrm{ISR}} $ and $ M_{\perp} $ bin definitions for 2L regions for each $ N_{\text{jet}}^{\mathrm{S}} $ multiplicity. The highest (2J) is inclusive ($ N_{\text{jet}}^{\mathrm{S}} \geq $ 2). The lower $ R_{\mathrm{ISR}} $ bins denoted as "CR" are used as control regions. |
png pdf |
Table 7:
Category definitions for the 3L regions for each $ N_{\text{jet}}^{\mathrm{S}} $ multiplicity. The highest (1J) is inclusive ($ N_{\text{jet}}^{\mathrm{S}} \geq $ 1). There is a total of 15 exclusive 3L categories. |
png pdf |
Table 8:
The $ R_{\mathrm{ISR}} $ and $ M_{\perp} $ bin definitions for 3L regions for each $ N_{\text{jet}}^{\mathrm{S}} $ multiplicity. The highest (1J) is inclusive ($ N_{\text{jet}}^{\mathrm{S}} \geq $ 1). The lower $ R_{\mathrm{ISR}} $ bins denoted as "CR" are used as control regions. An additional control region with 0.5 $ \leq R_{\mathrm{ISR}} < $ 0.6 is also used with the 0 S-jet region. |
png pdf |
Table 9:
List of categories and $ M_{\perp} $/$ R_{\mathrm{ISR}} $ bins corresponding to each model-independent superbin. |
png pdf |
Table 10:
Summary of systematic uncertainties for the full fit. The number of nuisance parameters is listed, with details as to how they are partitioned by data-taking period. The range of the parameter impact variation post-fit is given in the final column. |
png pdf |
Table 11:
Event counts observed in data, $ N_{\text{obs}} $, in each of the model-independent bins, compared with predictions from the CR fit, $ N^{\text{pred}}_{\text{bkg}} $, their corresponding uncertainties, $ \sigma(N^{\text{pred}}_{\text{bkg}}) $, and the upper limits at 95% CL on the signal strength ($ S_{\mathrm{UL}}^{95%} $) in event counts. All superbins are mutually exclusive except the b jets low-$ \Delta m $ case which aggregates the b jets low-$ \Delta m $ 1L, b jets low-$ Delta m $ 2L, and SV superbins. |
| Summary |
| A general search has been presented for supersymmetric particles (sparticles) in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the LHC using a data sample corresponding to an integrated luminosity of 138 fb$ ^{-1} $. A wide range of potential sparticle signatures are targeted including production of pairs of electroweakinos, sleptons, and top squarks. The search is focused on events with a high transverse momentum system from initial-state-radiation jets recoiling against a potential sparticle system with significant missing transverse momentum. Events are categorized based on their lepton multiplicity, jet multiplicity, b tags, and kinematic variables sensitive to the sparticle masses and mass splittings. The sensitivity extends to higher parent sparticle masses than previously probed at the LHC for production of pairs of electroweakinos, sleptons, and top squarks for compressed mass spectra. The results on pair production of charginos and sleptons in the compressed mass regime extend well beyond the canonical 100 GeV sparticle mass scale previously explored at LEP. The observed results demonstrate reasonable agreement with the predictions of the background-only model and model-independent event count upper limits for seven mutually exclusive event selections are reported. Competitive 95% confidence level (CL) lower mass limits are set on sparticle pair production, especially in the compressed mass regime, with mass differences between the lightest and parent sparticle as low as 3 GeV being tested. Top squark mass limits for three decay models are presented in the plane of the top squark mass and the mass difference. Limits on the decay via a top quark extend to 780 GeV with a mass of 750 GeV excluded at 95% CL or higher for mass differences between 60 and 175 GeV; the most stringent exclusion is at a mass difference of 150 GeV. Limits on the decay via a bottom quark and an intermediate chargino extend to 620 GeV with a mass of 550 GeV excluded at 95% CL or higher for mass differences between 35 and 140 GeV; the most stringent exclusion is at mass differences of between 50 and 90 GeV. Limits on the decay via a charm quark extend to 660 GeV with a mass of 520 GeV excluded at 95% CL or higher for mass differences between 10 and 60 GeV; the most stringent exclusion is at a mass difference of 20 GeV. The 95% CL lower mass limits on chargino-neutralino production assuming heavy sleptons extend to 325 (175) GeV for wino (higgsino) cross sections, where the most stringent mass limits are set for mass differences of 50 (10) GeV. The limits with wino cross sections exceed 300 GeV for the broad range of mass differences between 8 and 65 GeV, while the limits with the higgsino cross section assumption exceed 163 GeV for mass differences between 3 and 50 GeV. For chargino pair production, 95% CL lower mass limits are obtained for wino cross sections and decay via a W boson. These extend to 200 GeV with the most stringent mass limit set for a mass difference of 5 GeV while masses exceeding 120 GeV are excluded for all mass differences above 5 GeV. Related chargino pair production limits for the case of decays via sleptons and sneutrinos and with wino cross sections extend to 490 GeV for a mass difference of 55 GeV. The 95% CL lower mass limits on pair production of charged sleptons extend to 168 GeV (slepton partner of right-handed lepton only), 240 GeV (slepton partner of left-handed lepton only), and 270 GeV (both sleptons mass degenerate) for the most favorable mass splitting of around 5 GeV for the case of mass-degenerate first- and second-generation sleptons. Slepton masses exceeding 110, 175, and 200 GeV for all mass splittings ranging from 3 to 80 GeV are excluded at 95% CL or higher for the same three cases respectively. Similar results are also presented separately for selectrons and smuons assuming that the other slepton is not produced. For selectrons (smuons), the most stringent 95% CL lower mass limits are set at 160, 230, 250 GeV (145, 195, 240 GeV) for mass differences around 5 GeV for the three cases and with sensitivity to a broad range of mass differences from 3 to 100 GeV. |
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