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Search for high-mass resonances in dilepton final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV

The CMS collaboration
JHEP 1806 (2018) 120, 2018

Abstract (data abstract)
A search is presented for new high-mass resonances decaying into electron or muon pairs. The search uses proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the LHC in 2016, corresponding to an integrated luminosity of $36\mathrm{fb}^{-1}$. Observations are in agreement with standard model expectations. Upper limits on the product of a new resonance production cross section and branching fraction to dileptons are calculated in a model-independent manner. This permits the interpretation of the limits in models predicting a narrow dielectron or dimuon resonance. A scan of different intrinsic width hypotheses is performed. Limits are set on the masses of various hypothetical particles. For the $Z'_{\mathrm{SSM}}$ ($Z'_{\mathrm{\Psi}}$) particle, which arises in the sequential standard model (superstring-inspired model), a lower mass limit of 4.50 (3.90) TeV is set at 95% confidence level. The lightest Kaluza--Klein graviton arising in the Randall--Sundrum model of extra dimensions, with coupling parameters $k/\overline{M}_\mathrm{Pl}$ of 0.01, 0.05, and 0.10, is excluded at 95% confidence level below 2.10, 3.65, and 4.25 TeV, respectively. In a simplified model of dark matter production via a vector or axial vector mediator, limits at 95% confidence level are obtained on the masses of the dark matter particle and its mediator.

  • Data and estimated background yields in the dielectron channel

    Data from Table 2.

    10.17182/hepdata.83971.v1/t1

    The number of dielectron events in various invariant mass ranges. The total back- ground is the sum of the events...

  • Data and estimated background yields in the dimuon channel

    Data from Table 3.

    10.17182/hepdata.83971.v1/t2

    The number of dimuon events in various invariant mass ranges. The total back- ground is the sum of the events...

  • Dielectron mass distribution

    Data from Figure 1, left panel.

    10.17182/hepdata.83971.v1/t3

    The invariant mass spectra of dielectron events. The points with error bars represent the observed yield. The histogram represents the...

  • Dimuon mass distribution

    Data from Figure 1, right panel.

    10.17182/hepdata.83971.v1/t4

    The invariant mass spectra of dimuon events. The points with error bars represent the observed yield. The histogram represents the...

  • Cumulative dielectron mass distribution

    Data from Figure 2, left panel.

    10.17182/hepdata.83971.v1/t5

    The cumulative distributions, where all events above the specified mass on the x axis are summed, of the invariant mass...

  • Cumulative dimuon mass distribution

    Data from Figure 2, left panel.

    10.17182/hepdata.83971.v1/t6

    The cumulative distributions, where all events above the specified mass on the x axis are summed, of the invariant mass...

  • Observed limit in narrow width, spin 1

    Data from all panels of Figure 3, all panels

    10.17182/hepdata.83971.v1/t7

    The observed upper limits at 95% CL on the product of production cross section and branching fraction for a spin-1...

  • Expected limits in narrow width, spin 1

    Data from Figure 3.

    10.17182/hepdata.83971.v1/t8

    The expected upper limits together with the 68 and 95% quantiles at 95% CL on the product of production cross...

  • Observed limit in narrow width, spin 2

    Data from all panels of Figure 7, all panels.

    10.17182/hepdata.83971.v1/t9

    The observed upper limits at 95% CL on the product of production cross section and branching fraction for a spin-2...

  • Expected limits in narrow width, spin 2

    Data from all panels of Figure 7.

    10.17182/hepdata.83971.v1/t10

    The expected upper limits together with the 68 and 95% quantiles at 95% CL on the product of production cross...

  • Observed limits for different widths, spin 1

    Data from all panels of Figure 7, all panels.

    10.17182/hepdata.83971.v1/t11

    The observed upper limits at 95% CL on the product of production cross section and branching fraction for a spin-1...

  • Expected limits for different widths, spin 1

    Data from all panels of Figure 7, all panels.

    10.17182/hepdata.83971.v1/t12

    The expected upper limits at 95% CL on the product of production cross section and branching fraction for a spin-1...

  • Curve for GSM models in the $c_{u}$-$c_{d}$ scan in Figure 5

    Data from Figure 5.

    10.17182/hepdata.83971.v1/t13

    Limits in the ( $c_{d}$ , $c_{u}$ ) plane obtained by recasting the combined limit at 95% CL on the...

  • Curve for LR models in the $c_{u}$-$c_{d}$ scan in Figure 5

    Data from Figure 5.

    10.17182/hepdata.83971.v1/t14

    Limits in the ( $c_{d}$ , $c_{u}$ ) plane obtained by recasting the combined limit at 95% CL on the...

  • Curve for E6 models in the $c_{u}$-$c_{d}$ scan in Figure 5

    Data from Figure 5.

    10.17182/hepdata.83971.v1/t15

    Limits in the ( $c_{d}$ , $c_{u}$ ) plane obtained by recasting the combined limit at 95% CL on the...

  • Local p-Values for different widths in the dielectron channel

    Data from Figure 6, top left panel.

    10.17182/hepdata.83971.v1/t16

    The observed local p-value for the dielectron channel as a function of the dilepton invariant mass.

  • Local p-Values for different widths in the dimuon channel

    Data from Figure 6, top left panel.

    10.17182/hepdata.83971.v1/t17

    The observed local p-value for the dimuon channel as a function of the dilepton invariant mass.

  • Local p-Values for different widths in the combined channel

    Data from Figure 6, top left panel.

    10.17182/hepdata.83971.v1/t18

    The observed local p-value for the combined channel as a function of the dilepton invariant mass.

  • DM exclusion contour (Vector, Expected)

    Data from Figure 8 (left).

    10.17182/hepdata.83971.v1/t19

    Limits at 95% confidence level for the masses of the DM particle, which is assumed to be Dirac fermion, and...

  • First DM exclusion contour (Vector, Observed)

    Data from Figure 8 (left).

    10.17182/hepdata.83971.v1/t20

    Limits at 95% confidence level for the masses of the DM particle, which is assumed to be Dirac fermion, and...

  • Second DM exclusion contour (Vector, Observed)

    Data from Figure 8 (left).

    10.17182/hepdata.83971.v1/t21

    Limits at 95% confidence level for the masses of the DM particle, which is assumed to be Dirac fermion, and...

  • DM exclusion contour (Axial, Expected)

    Data from Figure 8 (right).

    10.17182/hepdata.83971.v1/t22

    Limits at 95% confidence level for the masses of the DM particle, which is assumed to be Dirac fermion, and...

  • DM exclusion contour (Axial, Observed)

    Data from Figure 8 (right).

    10.17182/hepdata.83971.v1/t23

    Limits at 95% confidence level for the masses of the DM particle, which is assumed to be Dirac fermion, and...

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