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Search for top squarks in final states with two top quarks and several light-flavor jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV

The CMS collaboration
CMS-SUS-19-004, 2021.

Abstract
Many new physics models, including versions of supersymmetry characterized by $R$-parity violation (RPV), compressed mass spectra, long decay chains, or additional hidden sectors, predict the production of events with top quarks, low missing transverse momentum, and many additional quarks or gluons. The results of a search for new physics in events with two top quarks and additional jets are reported. The search is performed using events with at least seven jets and exactly one electron or muon. No requirement on missing transverse momentum is imposed. The study is based on a sample of proton-proton collisions at $\sqrt{s} =$ 13 TeV corresponding to 137 fb$^{-1}$ of integrated luminosity collected with the CMS detector at the LHC in 2016-2018. The data are used to determine best fit values and upper limits on the cross section for pair production of top squarks in scenarios of RPV and stealth supersymmetry. Top squark masses up to 670 (870) GeV are excluded at 95% confidence level for the RPV (stealth) scenario, and the maximum observed local significance is 2.8 standard deviations for the RPV scenario with top squark mass of 400 GeV.

  • Figure 4a

    Data from Figure 4, located on page 11

    10.17182/hepdata.103064.v1/t1

    Fitted background prediction and observed data counts for 2016 as functions of $N_{\text{jets}}$ in each of the four $S_{\textrm{NN}}$ bins....

  • Figure 4b

    Data from Figure 4, located on page 11

    10.17182/hepdata.103064.v1/t2

    Fitted background prediction and observed data counts for 2017 as functions of $N_{\text{jets}}$ in each of the four $S_{\textrm{NN}}$ bins....

  • Figure 4c

    Data from Figure 4, located on page 11

    10.17182/hepdata.103064.v1/t3

    Fitted background prediction and observed data counts for 2018A as functions of $N_{\text{jets}}$ in each of the four $S_{\textrm{NN}}$ bins....

  • Figure 4d

    Data from Figure 4, located on page 11

    10.17182/hepdata.103064.v1/t4

    Fitted background prediction and observed data counts for 2018B as functions of $N_{\text{jets}}$ in each of the four $S_{\textrm{NN}}$ bins....

  • Figure 6a

    Data from Figure 6a, located on page 13.

    10.17182/hepdata.103064.v1/t5

    Expected and observed 95% CL upper limit on the top squark pair production cross section as a function of the...

  • Figure 6b

    Data from Figure 6b, located on page 13.

    10.17182/hepdata.103064.v1/t6

    Expected and observed 95% CL upper limit on the top squark pair production cross section as a function of the...

  • Signal cutflow 2016

    Cut flow of the two signals shown in Figure 4a. $M(l,b)$ refers to the invariant mass of the system formed by the b-tagged jet and the lepton. At each stage of the cut flow all event weights used for the signal region are applied.

    10.17182/hepdata.103064.v1/t7

    Cut flow of the signal region selection decribed in section II.

  • Signal cutflow 2017

    Cut flow of the two signals shown in Figure 4b. $M(l,b)$ refers to the invariant mass of the system formed by the b-tagged jet and the lepton. At each stage of the cut flow all event weights used for the signal region are applied.

    10.17182/hepdata.103064.v1/t8

    Cut flow of the signal region selection decribed in section II.

  • Signal cutflow 2018A

    Cut flow of the two signals shown in Figure 4c. $M(l,b)$ refers to the invariant mass of the system formed by the b-tagged jet and the lepton. At each stage of the cut flow all event weights used for the signal region are applied.

    10.17182/hepdata.103064.v1/t9

    Cut flow of the signal region selection decribed in section II.

  • Signal cutflow 2018B

    Cut flow of the two signals shown in Figure 4d. $M(l,b)$ refers to the invariant mass of the system formed by the b-tagged jet and the lepton. At each stage of the cut flow all event weights used for the signal region are applied.

    10.17182/hepdata.103064.v1/t10

    Cut flow of the signal region selection decribed in section II.

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