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

The 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.

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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.

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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

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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...