Search for supersymmetry in final states with a single electron or muon using angular correlations and heavy-object identification in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 09 (2023) 149, 2023.

Abstract (data abstract)
A search for supersymmetry is presented in events with a single charged lepton, electron or muon, and multiple hadronic jets. The data correspond to an integrated luminosity of 138 $\textrm{fb}^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 $\textrm{TeV}$, recorded by the CMS experiment at the CERN LHC. The search targets gluino pair production, where the gluinos decay into final states with the lightest supersymmetric particle (LSP) and either a top quark-antiquark ($\textrm{t}\bar{\textrm{t}}$) pair, or a light-flavor quark-antiquark ($\textrm{q}\bar{\textrm{q}}$) pair and a virtual or on-shell $\textrm{W}$ boson. The main backgrounds, $\textrm{t}\bar{\textrm{t}}$ pair and $\textrm{W}$+jets production, are suppressed by requirements on the azimuthal angle between the momenta of the lepton and of its reconstructed parent $\textrm{W}$ boson candidate, and by top quark and $\textrm{W}$ boson identification based on a machine-learning technique. The number of observed events is consistent with the expectations from standard model processes. Limits are evaluated on supersymmetric particle masses in the context of two simplified models of gluino pair production. Exclusions for gluino masses reach up to 2120 (2050) $\textrm{GeV}$ at 95% confidence level for a model with gluino decay to a $\textrm{t}\bar{\textrm{t}}$ pair (a $\textrm{q}\bar{\textrm{q}}$ pair and a $\textrm{W}$ boson) and the LSP. For the same models, limits on the mass of the LSP reach up to 1250 (1070) $\textrm{GeV}$.

  • Figure 2a

    Data from Figure 2 (left).

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    Signal and background distributions of the $\Delta \phi$ variable, as predicted by simulation, for the multi-b analysis, requiring $n_{\textrm{jet}}\geq6$, $L_T>250~\mathrm{GeV}$,...

  • Figure 2b

    Data from Figure 2 (right).

    10.17182/hepdata.135454.v1/t2

    Signal and background distributions of the $\Delta \phi$ variable, as predicted by simulation, for the zero-b analysis, requiring $n_{\textrm{jet}}\geq6$, $L_T>350~\mathrm{GeV}$,...

  • Figure 3a

    Data from Figure 3 (left).

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    Distributions of $\Delta\phi$ as obtained from simulation, requiring various $\textrm{t}$ tag multiplicities for the total background.

  • Figure 3b

    Data from Figure 3 (right).

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    Distributions of $\Delta\phi$ as obtained from simulation, requiring various $\textrm{t}$ tag multiplicities for the signal in two representative combinations of...

  • Figure 6a

    Data from Figure 6 (left).

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    Results of fits to the $n_{\textrm{b}}$ multiplicity for control regions for the muon channel and with the requirements $3\leq n_{\textrm{jet}}\leq4$,...

  • Figure 6b

    Data from Figure 6 (right).

    10.17182/hepdata.135454.v1/t6

    Results of fits to the $n_{\textrm{b}}$ multiplicity for control regions for the muon channel and with the requirements $3\leq n_{\textrm{jet}}\leq4$,...

  • Figure 7a

    Data from Figure 7 (top left).

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    Jet multiplicity distribution after the single-lepton baseline selection excluding the SRs for the multi-b analysis. The simulation is normalized to...

  • Figure 7b

    Data from Figure 7 (top right).

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    Jet multiplicity distribution after the single-lepton baseline selection excluding the SRs for the the zero-b analysis (right). The simulation is...

  • Figure 7c

    Data from Figure 7 (middle left).

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    Jet multiplicity distribution in the dilepton CRs for the multi-b analysis. The simulation is normalized to data with the SF...

  • Figure 7d

    Data from Figure 7 (middle right).

    10.17182/hepdata.135454.v1/t10

    Jet multiplicity distribution in the dilepton CRs for the zero-b analysis. The simulation is normalized to data with the SF...

  • Figure 7e

    Data from Figure 7 (bottom left).

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    The double ratio of the single-lepton and dilepton ratio between data and simulation together with fit results and their uncertainties...

  • Figure 7f

    Data from Figure 7 (bottom right).

    10.17182/hepdata.135454.v1/t12

    The double ratio of the single-lepton and dilepton ratio between data and simulation together with fit results and their uncertainties...

  • Figure 8a

    Data from Figure 8 (left).

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    The prefit $L_{\mathrm{P}}$ distribution for selected electron candidates in the baseline QCD selection, with modified requirements of $n_{\text{jet}}\in[3,4]$ and $n_{\mathrm{b}}=0$.

  • Figure 8b

    Data from Figure 8 (right).

    10.17182/hepdata.135454.v1/t14

    The prefit $L_{\mathrm{P}}$ distribution for anti-selected electron candidates in the baseline QCD selection, with modified requirements of $n_{\text{jet}}\in[3,4]$ and $n_{\mathrm{b}}=0$.

  • Figure 9

    Data from Figure 9.

    10.17182/hepdata.135454.v1/t15

    Observed event yields in the MB SRs of the multi-b analysis compared to signal and background predictions. The relative fraction...

  • Figure 10

    Data from Figure 10.

    10.17182/hepdata.135454.v1/t16

    Observed event yields in the MB SRs of the zero-b analysis compared to signal and background predictions. The $\textrm{W}$+jets, $\textrm{t}\bar{\textrm{t}}$+jets,...

  • Figure 11a Cross Section

    Data from Figure 11 (left).

    10.17182/hepdata.135454.v1/t17

    Cross section limits at 95% CL for the T1tttt (left) model, as functions of the gluino and LSP masses, assuming...

  • Figure 11a Observed Limit Contour

    Data from Figure 11 (left).

    10.17182/hepdata.135454.v1/t18

    Cross section limits at 95% CL for the T1tttt model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11a Observed Limit Contour + 1$\sigma$

    Data from Figure 11 (left).

    10.17182/hepdata.135454.v1/t19

    Cross section limits at 95% CL for the T1tttt model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11a Observed Limit Contour - 1$\sigma$

    Data from Figure 11 (left).

    10.17182/hepdata.135454.v1/t20

    Cross section limits at 95% CL for the T1tttt model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11a Expected Limit Contour

    Data from Figure 11 (left).

    10.17182/hepdata.135454.v1/t21

    Cross section limits at 95% CL for the T1tttt model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11a Expected Limit Contour + 1$\sigma$

    Data from Figure 11 (left).

    10.17182/hepdata.135454.v1/t22

    Cross section limits at 95% CL for the T1tttt model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11a Expected Limit Contour - 1$\sigma$

    Data from Figure 11 (left).

    10.17182/hepdata.135454.v1/t23

    Cross section limits at 95% CL for the T1tttt model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11b Cross Section

    Data from Figure 11 (right).

    10.17182/hepdata.135454.v1/t24

    Cross section limits at 95% CL for the T5qqqqWW model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11b Observed Limit Contour

    Data from Figure 11 (right).

    10.17182/hepdata.135454.v1/t25

    Cross section limits at 95% CL for the T5qqqqWW model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11b Observed Limit Contour + 1$\sigma$

    Data from Figure 11 (right).

    10.17182/hepdata.135454.v1/t26

    Cross section limits at 95% CL for the T5qqqqWW model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11b Observed Limit Contour - 1$\sigma$

    Data from Figure 11 (right).

    10.17182/hepdata.135454.v1/t27

    Cross section limits at 95% CL for the T5qqqqWW model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11b Expected Limit Contour

    Data from Figure 11 (right).

    10.17182/hepdata.135454.v1/t28

    Cross section limits at 95% CL for the T5qqqqWW model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11b Expected Limit Contour + 1$\sigma$

    Data from Figure 11 (right).

    10.17182/hepdata.135454.v1/t29

    Cross section limits at 95% CL for the T5qqqqWW model, as functions of the gluino and LSP masses, assuming a...

  • Figure 11b Expected Limit Contour - 1$\sigma$

    Data from Figure 11 (right).

    10.17182/hepdata.135454.v1/t30

    Cross section limits at 95% CL for the T5qqqqWW model, as functions of the gluino and LSP masses, assuming a...

  • Table 2 Multi-b MB SR bin event yields

    Data from Table 2.

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    Observed number of events in the MB SR bins of the multi-b analysis. All bins are defined with $\Delta\phi >...

  • Table 3 Zero-b MB SR bin event yields

    Data from Table 3.

    10.17182/hepdata.135454.v1/t32

    Observed number of events in the MB SR bins of the zero-b analysis.

  • Covariance and correlation matrix Multi-b

    Additional material

    10.17182/hepdata.135454.v1/t33

    The simplified likelihood can be constructed using this covariance matrix of nuisance parameters in the signal region (MB SR). The...

  • Selection Efficiency Multi-b

    Additional material

    10.17182/hepdata.135454.v1/t34

    Selection efficiency for the multi-b signal for the SRs.

  • Covariance and correlation matrix Zero-b

    Additional material

    10.17182/hepdata.135454.v1/t35

    The simplified likelihood can be constructed using this covariance matrix of nuisance parameters in the signal region (MB SR). The...

  • Selection Efficiency Zero-b

    Additional Material

    10.17182/hepdata.135454.v1/t36

    Selection efficiency for the zero-b signal for the SRs. The bins correspond to the aggregated bins that were used for...

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