{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.79809.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1634253"}},{"@id":"https://doi.org/10.1103/PhysRevD.97.032009","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2018","description":"CERN-LHC.  Search for top squarks and dark matter particles in opposite-charge dilepton final states at sqrt(s) = 13 TeV\n\nA search for new physics is presented in final states with two oppositely charged leptons (electrons or muons), jets identified as originating from b quarks, and missing transverse momentum (pTmiss).\nThe search uses proton-proton collision data at 13 TeV amounting to 35.9 $fb^{\u22121}$ of integrated luminosity collected using the CMS detector in 2016.\nHypothetical signal events are efficiently separated from the dominant ttbar background with requirements on pTmiss and transverse mass variables.\nNo significant deviation is observed from the expected background.\nExclusion limits are set in the context of simplified supersymmetric models with pair-produced top squarks.\nFor top squarks, decaying exclusively to a top quark and a neutralino, exclusion limits are placed at 95% confidence level on the mass of the lightest top squark up to 800 GeV and on the lightest neutralino up to 360 GeV.\nThese results, combined with searches in the single-lepton and all-jet final states, raise the exclusion limits up to 1050 GeV for the lightest top squark and up to 500 GeV for the lightest neutralino.\nFor top squarks undergoing a cascade decay through charginos and sleptons, the mass limits reach up to 1300 GeV for top squarks and up to 800 GeV for the lightest neutralino.\nThe results are also interpreted in a simplified model with a dark matter (DM) particle coupled to the top quark through a scalar or pseudoscalar mediator.\nFor light DM, mediator masses up to 100 (50) GeV are excluded for scalar (pseudoscalar) mediators.\nThe result for the scalar mediator achieves some of the most stringent limits to date in this model.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t1","@type":"Dataset","description":"Figure 2 (left). Distribution of $M_{T2}(ll)$ in simulation after preselection and requiring $M_{T2}(ll) > 100$ GeV.","name":"Figure 2a"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t2","@type":"Dataset","description":"Figure 2 (center). Distribution of $M_{T2}(blbl)$ in simulation after preselection and requiring $M_{T2}(ll) > 100$ GeV.","name":"Figure 2b"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t3","@type":"Dataset","description":"Figure 2 (right). Distribution of $p_{T}^{miss}$ in simulation after preselection and requiring $M_{T2}(ll) > 100$ GeV.","name":"Figure 2c"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t4","@type":"Dataset","description":"Figure 3 (upper). Distribution of $M_{T2}(ll)$ in a control region enriched in $t\\bar{t}$ events defined by requiring at least 2...","name":"Figure 3a"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t5","@type":"Dataset","description":"Figure 4 (upper). Expected and observed yields in the five $t\\bar{t}Z$ control regions, which are defined by different requirements on...","name":"Figure 4a"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t6","@type":"Dataset","description":"Figure 4 (lower). Expected and observed yields in the five $t\\bar{t}Z$ control regions, which are defined by different requirements on...","name":"Figure 4b"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t7","@type":"Dataset","description":"Figure 5 (left). Distribution of $M_{T2}(ll)$ of SF events falling within in the Z boson mass window with at least...","name":"Figure 5a"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t8","@type":"Dataset","description":"Figure 5 (center). Distribution of $M_{T2}(blbl)$ of SF events falling within in the Z boson mass window with at least...","name":"Figure 5b"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t9","@type":"Dataset","description":"Figure 5 (right). Distribution of $p_{T}^{miss}$ of SF events falling within in the Z boson mass window with at least...","name":"Figure 5c"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t10","@type":"Dataset","description":"Figure 6. Event yields in the 13 Drell-Yan and multiboson control regions for events with SF leptons falling within the...","name":"Figure 6"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t11","@type":"Dataset","description":"Figure 7 (left). Distributions of $M_{T2}(ll)$ for observed events in the dimuon channel compared to the predicted SM background.","name":"Figure 7a"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t12","@type":"Dataset","description":"Figure 7 (center). Distributions of $M_{T2}(ll)$ for observed events in the dielectron channel compared to the predicted SM background.","name":"Figure 7b"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t13","@type":"Dataset","description":"Figure 7 (right). Distributions of $M_{T2}(ll)$ for observed events in the electron-muon channel compared to the predicted SM background.","name":"Figure 7c"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t14","@type":"Dataset","description":"Figure 8 (left). Distributions of $M_{T2}(ll)$ for all lepton flavors for the defined selection.","name":"Figure 8a"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t15","@type":"Dataset","description":"Figure 8 (center). Distributions of $M_{T2}(blbl)$ for all lepton flavors for the defined selection, after requiring $M_{T2}(ll) > 100$ GeV.","name":"Figure 8b"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t16","@type":"Dataset","description":"Figure 8 (right). Distributions of $p_{T}^{miss}$ for all lepton flavors for the defined selection, after requiring $M_{T2}(ll) > 100$ GeV.","name":"Figure 8c"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t17","@type":"Dataset","description":"Figure 9 (upper). Predicted backgrounds and observed yields in the dielectron and dimuon search regions. The yields are post fit...","name":"Figure 9a"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t18","@type":"Dataset","description":"Figure 9 (lower). Predicted backgrounds and observed yields in the electron-muon search regions. The yields are post fit and correspond...","name":"Figure 9b"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t19","@type":"Dataset","description":"Figure 10. Predicted backgrounds and observed yields in all search regions combined. The yields are post fit and correspond to...","name":"Figure 10"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t20","@type":"Dataset","description":"Figure 11 (upper). Observed limits for the T2tt model in the top squark - LSP mass plane. The numbers indicate...","name":"Figure 11a"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t21","@type":"Dataset","description":"Figure 11 (upper). Observed exclusion region at 95% CL assuming 100% branching fraction.","name":"Figure 11a observed contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t22","@type":"Dataset","description":"Figure 11 (upper). Expected exclusion region at 95% CL assuming 100% branching fraction.","name":"Figure 11a expected contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t23","@type":"Dataset","description":"Figure 11 (lower). Observed limits for the T2bW model in the top squark - LSP mass plane. The numbers indicate...","name":"Figure 11b"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t24","@type":"Dataset","description":"Figure 11 (lower). Observed exclusion region at 95% CL assuming 100% branching fraction.","name":"Figure 11b observed contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t25","@type":"Dataset","description":"Figure 11 (lower). Expected exclusion region at 95% CL assuming 100% branching fraction.","name":"Figure 11b expected contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t26","@type":"Dataset","description":"Figure 12 (upper left). Observed limits for the T8bbllnunu model in the top squark - LSP mass plane. The numbers...","name":"Figure 12a"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t27","@type":"Dataset","description":"Figure 12 (upper left). Observed exclusion region at 95% CL assuming 100% branching fraction. $m_{\\tilde{\\chi}^{\\pm}_{1}} = 0.5 (m_{\\tilde{t}_{1}} + m_{\\tilde{\\chi}^{0}_{1}})$,...","name":"Figure 12a observed contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t28","@type":"Dataset","description":"Figure 12 (upper left). Expected exclusion region at 95% CL assuming 100% branching fraction. $m_{\\tilde{\\chi}^{\\pm}_{1}} = 0.5 (m_{\\tilde{t}_{1}} + m_{\\tilde{\\chi}^{0}_{1}})$,...","name":"Figure 12a expected contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t29","@type":"Dataset","description":"Figure 12 (upper left). Observed limits for the T8bbllnunu model in the top squark - LSP mass plane. The numbers...","name":"Figure 12b"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t30","@type":"Dataset","description":"Figure 12 (upper left). Observed exclusion region at 95% CL assuming 100% branching fraction. $m_{\\tilde{\\chi}^{\\pm}_{1}} = 0.5 (m_{\\tilde{t}_{1}} + m_{\\tilde{\\chi}^{0}_{1}})$,...","name":"Figure 12b observed contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t31","@type":"Dataset","description":"Figure 12 (upper left). Expected exclusion region at 95% CL assuming 100% branching fraction. $m_{\\tilde{\\chi}^{\\pm}_{1}} = 0.5 (m_{\\tilde{t}_{1}} + m_{\\tilde{\\chi}^{0}_{1}})$,...","name":"Figure 12b expected contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t32","@type":"Dataset","description":"Figure 12 (lower). Observed limits for the T8bbllnunu model in the top squark - LSP mass plane. The numbers indicate...","name":"Figure 12c"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t33","@type":"Dataset","description":"Figure 12 (lower). Observed exclusion region at 95% CL assuming 100% branching fraction. $m_{\\tilde{\\chi}^{\\pm}_{1}} = 0.5 (m_{\\tilde{t}_{1}} + m_{\\tilde{\\chi}^{0}_{1}})$, $m_{\\tilde{l}}...","name":"Figure 12c observed contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t34","@type":"Dataset","description":"Figure 12 (lower). Expected exclusion region at 95% CL assuming 100% branching fraction. $m_{\\tilde{\\chi}^{\\pm}_{1}} = 0.5 (m_{\\tilde{t}_{1}} + m_{\\tilde{\\chi}^{0}_{1}})$, $m_{\\tilde{l}}...","name":"Figure 12c expected contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t35","@type":"Dataset","description":"Figure 13. Observed limits for the T2tt model in the top squark - LSP mass plane combining the dilepton final...","name":"Figure 13"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t36","@type":"Dataset","description":"Figure 13. Observed exclusion region at 95% CL assuming 100% branching fraction.","name":"Figure 13 observed contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t37","@type":"Dataset","description":"Figure 13. Expected exclusion region at 95% CL assuming 100% branching fraction.","name":"Figure 13 expected contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t38","@type":"Dataset","description":"Figure 14. Observed limits for the T2bW model in the top squark - LSP mass plane combining the dilepton final...","name":"Figure 14"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t39","@type":"Dataset","description":"Figure 14. Observed exclusion region at 95% CL assuming 100% branching fraction.","name":"Figure 14 observed contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t40","@type":"Dataset","description":"Figure 14. Expected exclusion region at 95% CL assuming 100% branching fraction.","name":"Figure 14 expected contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t41","@type":"Dataset","description":"Additional Figure 3. Observed limits for the T2tt model in the top squark - LSP mass plane using aggregate signal...","name":"Additional Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t42","@type":"Dataset","description":"Additional Figure 3. Observed exclusion region at 95% CL assuming 100% branching fraction.","name":"Additional Figure 3 observed contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t43","@type":"Dataset","description":"Additional Figure 3. Expected exclusion region at 95% CL assuming 100% branching fraction.","name":"Additional Figure 3 expected contour"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t44","@type":"Dataset","description":"Table 5. Ratios of $\\mu=\\frac{\\sigma$}{\\sigma_{theory}}$ of the 95% CL expected and observed limits to simplified model expectations for different DM...","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t45","@type":"Dataset","description":"Table 6. Expected and observed event yields, summed over all lepton flavors, in aggregate signal regions.","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t46","@type":"Dataset","description":"Table 7 (upper). Covariance matrix for the background prediction in aggregate signal regions.","name":"Table 7a"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t47","@type":"Dataset","description":"Table 7 (lower). Correlation matrix for the background prediction in aggregate signal regions.","name":"Table 7b"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t48","@type":"Dataset","description":"Additional Figure 1. Correlation matrix of the 13 signal regions, split into same-flavor (SF) and different-flavor (DF) regions.","name":"Correlation"},{"@id":"https://doi.org/10.17182/hepdata.79809.v1/t49","@type":"Dataset","description":"Additional Figure 2. Covariance matrix of the 13 signal regions, split into same-flavor (SF) and different-flavor (DF) regions.","name":"Covariance"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1634253?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/79809"}],"inLanguage":"en","name":"Search for top squarks and dark matter particles in opposite-charge dilepton final states at $\\sqrt{s}=$ 13 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1634253?version=1","version":1}