Search for top squark production in fully-hadronic final states in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The CMS collaboration
Phys.Rev.D 104 (2021) 052001, 2021.

Abstract (data abstract)
A search for production of the supersymmetric partners of the top quark, top squarks, is presented.The search is based on proton-proton collision events containing multiple jets, no leptons, and large transverse momentum imbalance.The data were collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV, and correspond to an integrated luminosity of 137 $fb^-1$.The targeted signal production scenarios are direct and gluino-mediated top squark production, including scenarios in which the top squark and neutralino masses are nearly degenerate.The search utilizes novel algorithms based on deep neural networks that identify hadronically decaying top quarks and W bosons, which are expected in many of the targeted signal models.No statistically significant excess of events is observed relative to the expectation from the standard model, andlimits on the top squark production cross section are obtained in the context of simplified supersymmetric models for various production and decay modes.Exclusion limits as high as 1310 GeV are established at the 95% confidence level on the mass of the top squark for direct top squark production models,and as high as 2260 GeV on the mass of the gluino for gluino-mediated top squark production models.These results represent a significant improvement over the results of previous searches for supersymmetry by CMS in the same final state.

  • Figure 03-a

    Data from Figure 03-a (left) of publication

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    Top quark tagging efficiencies are shown as a function of the generator-level top quark $p_T$ for the merged tagging algorithm...

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    W boson tagging efficiencies are shown as a function of the generator-level W boson $p_T$ for the merged tagging algorithm...

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    Comparison between data and simulation in the high $\Delta$m portion of the $\ell+\text{jets}$ control region as a function of $p_T^{miss}$...

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    The ratio between the observed data and the simulation in the high $\Delta$m portion of the $\ell+\text{jets}$ control region as...

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    Comparison between data and simulation in the high $\Delta$m portion of the $\ell+\text{jets}$ control region as a function of $N_t$...

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    The ratio between the observed data and the simulation in the high $\Delta$m portion of the $\ell+\text{jets}$ control region as...

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    Comparison between data and simulation in the high $\Delta$m portion of the $\ell+\text{jets}$ control region as a function of $N_W$...

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    The ratio between the observed data and the simulation in the high $\Delta$m portion of the $\ell+\text{jets}$ control region as...

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    Comparison between data and simulation in the high $\Delta$m portion of the $\ell+\text{jets}$ control region as a function of $N_{\text{res}}$...

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    The ratio between the observed data and the simulation in the high $\Delta$m portion of the $\ell+\text{jets}$ control region as...

  • Figure 06-a Event Yields

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    Observed event yields in data (black points) and predicted SM background (filled histograms) for the low $\Delta$m search bins 0--52....

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    The ratio of the data to the total background prediction for the low $\Delta$m search bins 0--52. The hatched bands...

  • Figure 06-b Event Yields

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    Observed event yields in data (black points) and predicted SM background (filled histograms) for the high $\Delta$m search bins 53--104....

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    The ratio of the data to the total background prediction for the high $\Delta$m search bins 53--104. The hatched bands...

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    Observed event yields in data (black points) and predicted SM background (filled histograms) for the high $\Delta$m search bins 105--152...

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    The ratio of the data to the total background prediction for the high $\Delta$m search bins 105--152 with ${N_b =...

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    Observed event yields in data (black points) and predicted SM background (filled histograms) for the high $\Delta$m search bins 153--182...

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    The ratio of the data to the total background prediction for the high $\Delta$m search bins 153--182 with ${N_b \geq...

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    The observed exclusion contour of the T2tt simplified model with respect to approximate NNLO+NNLL signal cross sections and the change...

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    The mean expected exclusion contour of the T2tt simplified model and the region containing 68 and 95\% ($\pm 1$ and...

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    The observed 95% CL upper limit on the production cross section of the T2bW simplified model as a function of...

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    The expected 95% CL upper limit on the production cross section of the T2bW simplified model as a function of...

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    The observed exclusion contour of the T2bW simplified model with respect to approximate NNLO+NNLL signal cross sections and the change...

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    The mean expected exclusion contour of the T2bW simplified model and the region containing 68 and 95\% ($\pm 1$ and...

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    The observed 95% CL upper limit on the production cross section of the T2tb simplified model as a function of...

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    The expected 95% CL upper limit on the production cross section of the T2tb simplified model as a function of...

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    The observed exclusion contour of the T2tb simplified model with respect to approximate NNLO+NNLL signal cross sections and the change...

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    The mean expected exclusion contour of the T2tb simplified model and the region containing 68 and 95\% ($\pm 1$ and...

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    The observed 95% CL upper limit on the production cross section of the T2ttC simplified model as a function of...

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    The expected 95% CL upper limit on the production cross section of the T2ttC simplified model as a function of...

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    The observed exclusion contour of the T2ttC simplified model with respect to approximate NNLO+NNLL signal cross sections and the change...

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    The mean expected exclusion contour of the T2ttC simplified model and the region containing 68\% ($\pm 1\,\sigma_{\text{experiment}}$) of the distribution...

  • Figure 09-b observed

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    The observed 95% CL upper limit on the production cross section of the T2bWC simplified model as a function of...

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    The expected 95% CL upper limit on the production cross section of the T2bWC simplified model as a function of...

  • Figure 09-b Observed Lines

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    The observed exclusion contour of the T2bWC simplified model with respect to approximate NNLO+NNLL signal cross sections and the change...

  • Figure 09-b Expected Lines

    Data from Figure 09-b (Upper right) of publication

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    The mean expected exclusion contour of the T2bWC simplified model and the region containing 68\% ($\pm 1\,\sigma_{\text{experiment}}$) of the distribution...

  • Figure 09-c observed

    Data from Figure 09-c (Lower) of publication

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    The observed 95% CL upper limit on the production cross section of the T2cc simplified model as a function of...

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    The expected 95% CL upper limit on the production cross section of the T2cc simplified model as a function of...

  • Figure 09-c Observed Lines

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    The observed exclusion contour of the T2cc simplified model with respect to approximate NNLO+NNLL signal cross sections and the change...

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    The mean expected exclusion contour of the T2cc simplified model and the region containing 68\% ($\pm 1\,\sigma_{\text{experiment}}$) of the distribution...

  • Figure 10-a observed

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    The observed 95% CL upper limit on the production cross section of the T1tttt simplified model as a function of...

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    The expected 95% CL upper limit on the production cross section of the T1tttt simplified model as a function of...

  • Figure 10-a Observed Lines

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    The observed exclusion contour of the T1tttt simplified model with respect to approximate NNLO+NNLL signal cross sections and the change...

  • Figure 10-a Expected Lines

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    The mean expected exclusion contour of the T1tttt simplified model and the region containing 68 and 95\% ($\pm 1$ and...

  • Figure 10-b observed

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    The observed 95% CL upper limit on the production cross section of the T1ttbb simplified model as a function of...

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    The expected 95% CL upper limit on the production cross section of the T1ttbb simplified model as a function of...

  • Figure 10-b Observed Lines

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    The observed exclusion contour of the T1ttbb simplified model with respect to approximate NNLO+NNLL signal cross sections and the change...

  • Figure 10-b Expected Lines

    Data from Figure 10-b (Right) of publication

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    The mean expected exclusion contour of the T1ttbb simplified model and the region containing 68 and 95\% ($\pm 1$ and...

  • Figure 11 observed

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    The observed 95% CL upper limit on the production cross section of the T5ttcc simplified model as a function of...

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    The expected 95% CL upper limit on the production cross section of the T5ttcc simplified model as a function of...

  • Figure 11 Observed Lines

    Data from Figure 11 of publication

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    The observed exclusion contour of the T5ttcc simplified model with respect to approximate NNLO+NNLL signal cross sections and the change...

  • Figure 11 Expected Lines

    Data from Figure 11 of publication

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    The mean expected exclusion contour of the T5ttcc simplified model and the region containing 68% and 95% ($\pm 1$ and...

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