Search for physics beyond the standard model in multilepton final states in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The CMS collaboration
2019.

Abstract
A search for physics beyond the standard model in events with at least three charged leptons (electrons or muons) is presented. The data sample corresponds to an integrated luminosity of 137 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} =$ 13 TeV, collected with the CMS detector at the LHC in 2016-2018. The two targeted signal processes are pair production of type-III seesaw heavy fermions and production of a light scalar or pseudoscalar boson in association with a pair of top quarks. The heavy fermions may be manifested as an excess of events with large values of leptonic transverse momenta or missing transverse momentum. The light scalars or pseudoscalars may create a localized excess in the dilepton mass spectra. The results exclude heavy fermions of the type-III seesaw model for masses below 880 GeV at 95% confidence level in the scenario of equal branching fractions to each lepton flavor. This is the most restrictive limit on the flavor-democratic scenario of the type-III seesaw model to date. Assuming a Yukawa coupling of unit strength to top quarks, branching fractions of new scalar (pseudoscalar) bosons to dielectrons or dimuons above 0.004 (0.03) and 0.04 (0.03) are excluded at 95% confidence level for masses in the range 15-75 and 108-340 GeV, respectively. These are the first limits in these channels on an extension of the standard model with scalar or pseudoscalar particles.

  • Figure 2a

    Data from Figure 2a

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    The $M_{T}$ distribution in the WZ-enriched region. The last bin contains the overflow events.

  • Figure 2b

    Data from Figure 2b

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    The $L_{T}$ distribution in the ttZ-enriched region. The last bin contains the overflow events.

  • Figure 2c

    Data from Figure 2c

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    The $S_{T}$ distribution in the ZZ-enriched region. The last bin contains the overflow events.

  • Figure 2d

    Data from Figure 2d

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    The $L_{T}$ distribution in the MisID-enriched region. The last bin contains the overflow events.

  • Figure 3a

    Data from Figure 3a

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    The $L_{T}+p^{miss}_{T}$ distribution in the 3L below-Z signal region. The last bin contains the overflow events.

  • Figure 3b

    Data from Figure 3b

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    The $M_{T}$ distribution in the 3L on-Z signal region. The last bin contains the overflow events.

  • Figure 3c

    Data from Figure 3c

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    The $L_{T}+p^{miss}_{T}$ distribution in the 3L above-Z signal region. The last bin contains the overflow events.

  • Figure 3d

    Data from Figure 3d

    10.17182/hepdata.91969.v1/t8

    The $L_{T}+p^{miss}_{T}$ distribution in the 3L OSSF0 signal region. The last bin contains the overflow events.

  • Figure 4a

    Data from Figure 4a

    10.17182/hepdata.91969.v1/t9

    The $L_{T}+p^{miss}_{T}$ distribution in the 4L OSSF0 signal region. The last bin contains the overflow events.

  • Figure 4b

    Data from Figure 4b

    10.17182/hepdata.91969.v1/t10

    The $L_{T}+p^{miss}_{T}$ distribution in the 4L OSSF1 signal region. The last bin contains the overflow events.

  • Figure 4c

    Data from Figure 4c

    10.17182/hepdata.91969.v1/t11

    The $L_{T}+p^{miss}_{T}$ distribution in the 4L OSSF2 signal region. The last bin contains the overflow events.

  • Figure 5a

    Data from Figure 5a

    10.17182/hepdata.91969.v1/t12

    The dielectron $M_{OSSF}^{20}$ distribution in the 3L(ee) 0B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 5b

    Data from Figure 5b

    10.17182/hepdata.91969.v1/t13

    The dielectron $M_{OSSF}^{300}$ distribution in the 3L(ee) 0B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 5c

    Data from Figure 5c

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    The dielectron $M_{OSSF}^{20}$ distribution in the 3L(ee) 0B, 400<$S_{T}$<800 GeV signal region. The last bin does not contain the overflow...

  • Figure 5d

    Data from Figure 5d

    10.17182/hepdata.91969.v1/t15

    The dielectron $M_{OSSF}^{300}$ distribution in the 3L(ee) 0B, 400<$S_{T}$<800 GeV signal region. The last bin does not contain the overflow...

  • Figure 5e

    Data from Figure 5e

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    The dielectron $M_{OSSF}^{20}$ distribution in the 3L(ee) 0B, $S_{T}$>800 GeV signal region. The last bin does not contain the overflow...

  • Figure 5f

    Data from Figure 5f

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    The dielectron $M_{OSSF}^{300}$ distribution in the 3L(ee) 0B, $S_{T}$>800 GeV signal region. The last bin does not contain the overflow...

  • Figure 6a

    Data from Figure 6a

    10.17182/hepdata.91969.v1/t18

    The dielectron $M_{OSSF}^{20}$ distribution in the 3L(ee) 1B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 6b

    Data from Figure 6b

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    The dielectron $M_{OSSF}^{300}$ distribution in the 3L(ee) 1B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 6c

    Data from Figure 6c

    10.17182/hepdata.91969.v1/t20

    The dielectron $M_{OSSF}^{20}$ distribution in the 3L(ee) 1B, 400<$S_{T}$<800 GeV signal region. The last bin does not contain the overflow...

  • Figure 6d

    Data from Figure 6d

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    The dielectron $M_{OSSF}^{300}$ distribution in the 3L(ee) 1B, 400<$S_{T}$<800 GeV signal region. The last bin does not contain the overflow...

  • Figure 6e

    Data from Figure 6e

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    The dielectron $M_{OSSF}^{20}$ distribution in the 3L(ee) 1B, $S_{T}$>800 GeV signal region. The last bin does not contain the overflow...

  • Figure 6f

    Data from Figure 6f

    10.17182/hepdata.91969.v1/t23

    The dielectron $M_{OSSF}^{300}$ distribution in the 3L(ee) 1B, $S_{T}$>800 GeV signal region. The last bin does not contain the overflow...

  • Figure 7a

    Data from Figure 7a

    10.17182/hepdata.91969.v1/t24

    The dielectron $M_{OSSF}^{20}$ distribution in the 4L(ee) 0B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 7b

    Data from Figure 7b

    10.17182/hepdata.91969.v1/t25

    The dielectron $M_{OSSF}^{300}$ distribution in the 4L(ee) 0B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 7c

    Data from Figure 7c

    10.17182/hepdata.91969.v1/t26

    The dielectron $M_{OSSF}^{20}$ distribution in the 4L(ee) 0B, $S_{T}$>400 GeV signal region. The last bin does not contain the overflow...

  • Figure 7d

    Data from Figure 7d

    10.17182/hepdata.91969.v1/t27

    The dielectron $M_{OSSF}^{300}$ distribution in the 4L(ee) 0B, $S_{T}$>400 GeV signal region. The last bin does not contain the overflow...

  • Figure 7e

    Data from Figure 7e

    10.17182/hepdata.91969.v1/t28

    The dielectron $M_{OSSF}^{20}$ distribution in the 4L(ee) 1B signal region. The last bin does not contain the overflow events. The...

  • Figure 7f

    Data from Figure 7f

    10.17182/hepdata.91969.v1/t29

    The dielectron $M_{OSSF}^{300}$ distribution in the 4L(ee) 1B signal region. The last bin does not contain the overflow events. The...

  • Figure 8a

    Data from Figure 8a

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    The dimuon $M_{OSSF}^{20}$ distribution in the 3L($\mu\mu$) 0B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 8b

    Data from Figure 8b

    10.17182/hepdata.91969.v1/t31

    The dimuon $M_{OSSF}^{300}$ distribution in the 3L($\mu\mu$) 0B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 8c

    Data from Figure 8c

    10.17182/hepdata.91969.v1/t32

    The dimuon $M_{OSSF}^{20}$ distribution in the 3L($\mu\mu$) 0B, 400<$S_{T}$<800 GeV signal region. The last bin does not contain the overflow...

  • Figure 8d

    Data from Figure 8d

    10.17182/hepdata.91969.v1/t33

    The dimuon $M_{OSSF}^{300}$ distribution in the 3L($\mu\mu$) 0B, 400<$S_{T}$<800 GeV signal region. The last bin does not contain the overflow...

  • Figure 8e

    Data from Figure 8e

    10.17182/hepdata.91969.v1/t34

    The dimuon $M_{OSSF}^{20}$ distribution in the 3L($\mu\mu$) 0B, $S_{T}$>800 GeV signal region. The last bin does not contain the overflow...

  • Figure 8f

    Data from Figure 8f

    10.17182/hepdata.91969.v1/t35

    The dimuon $M_{OSSF}^{300}$ distribution in the 3L($\mu\mu$) 0B, $S_{T}$>800 GeV signal region. The last bin does not contain the overflow...

  • Figure 9a

    Data from Figure 9a

    10.17182/hepdata.91969.v1/t36

    The dimuon $M_{OSSF}^{20}$ distribution in the 3L($\mu\mu$) 1B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 9b

    Data from Figure 9b

    10.17182/hepdata.91969.v1/t37

    The dimuon $M_{OSSF}^{300}$ distribution in the 3L($\mu\mu$) 1B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 9c

    Data from Figure 9c

    10.17182/hepdata.91969.v1/t38

    The dimuon $M_{OSSF}^{20}$ distribution in the 3L($\mu\mu$) 1B, 400<$S_{T}$<800 GeV signal region. The last bin does not contain the overflow...

  • Figure 9d

    Data from Figure 9d

    10.17182/hepdata.91969.v1/t39

    The dimuon $M_{OSSF}^{300}$ distribution in the 3L($\mu\mu$) 1B, 400<$S_{T}$<800 GeV signal region. The last bin does not contain the overflow...

  • Figure 9e

    Data from Figure 9e

    10.17182/hepdata.91969.v1/t40

    The dimuon $M_{OSSF}^{20}$ distribution in the 3L($\mu\mu$) 1B, $S_{T}$>800 GeV signal region. The last bin does not contain the overflow...

  • Figure 9f

    Data from Figure 9f

    10.17182/hepdata.91969.v1/t41

    The dimuon $M_{OSSF}^{300}$ distribution in the 3L($\mu\mu$) 1B, $S_{T}$>800 GeV signal region. The last bin does not contain the overflow...

  • Figure 10a

    Data from Figure 10a

    10.17182/hepdata.91969.v1/t42

    The dimuon $M_{OSSF}^{20}$ distribution in the 4L($\mu\mu$) 0B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 10b

    Data from Figure 10b

    10.17182/hepdata.91969.v1/t43

    The dimuon $M_{OSSF}^{300}$ distribution in the 4L($\mu\mu$) 0B, $S_{T}$<400 GeV signal region. The last bin does not contain the overflow...

  • Figure 10c

    Data from Figure 10c

    10.17182/hepdata.91969.v1/t44

    The dimuon $M_{OSSF}^{20}$ distribution in the 4L($\mu\mu$) 0B, $S_{T}$>400 GeV signal region. The last bin does not contain the overflow...

  • Figure 10d

    Data from Figure 10d

    10.17182/hepdata.91969.v1/t45

    The dimuon $M_{OSSF}^{300}$ distribution in the 4L($\mu\mu$) 0B, $S_{T}$>400 GeV signal region. The last bin does not contain the overflow...

  • Figure 10e

    Data from Figure 10e

    10.17182/hepdata.91969.v1/t46

    The dimuon $M_{OSSF}^{20}$ distribution in the 4L($\mu\mu$) 1B signal region. The last bin does not contain the overflow events. The...

  • Figure 10f

    Data from Figure 10f

    10.17182/hepdata.91969.v1/t47

    The dimuon $M_{OSSF}^{300}$ distribution in the 4L($\mu\mu$) 1B signal region. The last bin does not contain the overflow events. The...

  • Figure 11

    Data from Figure 11

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    The 95% confidence level exclusion limits for the flavor-democratic scenario on the total production cross section of heavy fermion pairs.

  • Figure 12a

    Data from Figure 12a

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    The 95% confidence level exclusion limits on the product of the total production cross section of tt$\phi$(S) and $\mathcal{B}(\phi -...

  • Figure 12b

    Data from Figure 12b

    10.17182/hepdata.91969.v1/t50

    The 95% confidence level exclusion limits on the product of the total production cross section of tt$\phi$(PS) and $\mathcal{B}(\phi -...

  • Figure 12c

    Data from Figure 12c

    10.17182/hepdata.91969.v1/t51

    The 95% confidence level exclusion limits on the product of the total production cross section of tt$\phi$(S) and $\mathcal{B}(\phi -...

  • Figure 12d

    Data from Figure 12d

    10.17182/hepdata.91969.v1/t52

    The 95% confidence level exclusion limits on the product of the total production cross section of tt$\phi$(PS) and $\mathcal{B}(\phi -...

  • Figure 13a

    Data from Figure 13a

    10.17182/hepdata.91969.v1/t53

    The 95% confidence level exclusion limits on $g_{t}^2\mathcal{B}(\phi - {ee})$ for tt$\phi$(S).

  • Figure 13b

    Data from Figure 13b

    10.17182/hepdata.91969.v1/t54

    The 95% confidence level exclusion limits on $g_{t}^2\mathcal{B}(\phi - {ee})$ for tt$\phi$(PS).

  • Figure 13c

    Data from Figure 13c

    10.17182/hepdata.91969.v1/t55

    The 95% confidence level exclusion limits on $g_{t}^2\mathcal{B}(\phi - {\mu\mu})$ for tt$\phi$(S).

  • Figure 13d

    Data from Figure 13d

    10.17182/hepdata.91969.v1/t56

    The 95% confidence level exclusion limits on $g_{t}^2\mathcal{B}(\phi - {\mu\mu})$ for tt$\phi$(PS).

  • Table 4a

    Data from Table 4a

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    Product of the fiducial acceptance and the event selection efficiency for the type-III Seesaw signal model at various signal mass...

  • Table 4b

    Data from Table 4b

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    Product of the fiducial acceptance and the event selection efficiency for the tt$\phi$ signal models at various signal mass hypotheses...

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