Search for contact interactions and large extra dimensions in the dilepton mass spectra from proton-proton collisions at $\sqrt{s} =$ 13 TeV

The CMS collaboration
JHEP 1904 (2019) 114, 2019

Abstract (data abstract)
A search for nonresonant excesses in the invariant mass spectra of electron and muon pairs is presented. The analysis is based on data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS experiment in 2016, corresponding to a total integrated luminosity of $36\,\text{fb}^{-1}$. No significant deviation from the standard model is observed. Limits are set at 95% confidence level on energy scales for two general classes of nonresonant models. For a class of fermion contact interaction models, lower limits ranging from 20 to 32 TeV are set on the characteristic compositeness scale $\Lambda$. For the Arkani-Hamed, Dimopoulos, and Dvali model of large extra dimensions, the first results in the dilepton final state at 13 TeV are reported, and values of the ultraviolet cutoff parameter $\Lambda_{\text{T}}$ below 6.9 TeV are excluded. A combination with recent CMS diphoton results improves this exclusion to $\Lambda_{\text{T}}$ below 7.7 TeV, providing the most sensitive limits to date in nonhadronic final states.

  • Dielectron mass distribution

    Data from Figure 1, left panel.

    10.17182/hepdata.89049.v1/t1

    Electron pair invariant mass spectra for the combined barrel-barrel and barrel-endcap event categories. Example model predictions are given for CI....

  • Dimuon mass distribution

    Data from Figure 1, right panel.

    10.17182/hepdata.89049.v1/t2

    Muon pair invariant mass spectra for the combined barrel-barrel and barrel-endcap event categories. Example model predictions are given for the...

  • Limits on the CI scale Lambda in the electron channel

    Data from the left panel of Figure 2.

    10.17182/hepdata.89049.v1/t3

    Dilepton exclusion limits at 95% CL on the CI scale (Lambda) for the six CI models considered for the electron...

  • Limits on the CI scale Lambda in the muon channel

    Data from the right panel of Figure 2.

    10.17182/hepdata.89049.v1/t4

    Dilepton exclusion limits at 95% CL on the CI scale (Lambda) for the six CI models considered for the muon...

  • Combined limit on CI vs Lambda for the ConLL case

    Data from the left panel of Figure 3.

    10.17182/hepdata.89049.v1/t5

    Combined dilepton 95% CL exclusion limits on the cross section for the left-left constructive CI model. The red curve in...

  • Combined limits on the CI scale Lambda

    Data from the right panel of Figure 3.

    10.17182/hepdata.89049.v1/t6

    Combined dilepton 95% CL exclusion limits on the CI scale (Lambda) for the six different CI models considered. Thelimits are...

  • Limits on the UV cutoff in the ADD model in the electron channel

    Data from the left panel of Figure 4.

    10.17182/hepdata.89049.v1/t7

    Exclusion limits at 95% CL on the UV cutoff for the electron channel with m> 1.8 TeV in the GRW,...

  • Limits on the UV cutoff in the ADD model in the muon channel

    Data from the right panel of Figure 4.

    10.17182/hepdata.89049.v1/t8

    Exclusion limits at 95% CL on the UV cutoff for the muon channel with m> 1.8 TeV in the GRW,...

  • Combined limit in the ADD model vs the UV cutoff LambdaT

    Data from the left panel of Figure 5.

    10.17182/hepdata.89049.v1/t9

    Combined dilepton 95% CL exclusion limit on the cross section in the GRW convention with m > 1.8 TeV for...

  • Limits on the UV cutoff in the ADD model in the combined channel

    Data from the right panel of Figure 5.

    10.17182/hepdata.89049.v1/t10

    Combined dilepton 95% CL exclusion limits on the UV cutoff with m> 1.8 TeV in the GRW, Hewett, and HLZ...

  • ADD expected limits combination of all channels

    Data from the left panel of Figure 6.

    10.17182/hepdata.89049.v1/t11

    Individual and combined dilepton (this analysis) and diphoton 95% CL expected exclusion limits as a summary of all parameter conventions...

  • ADD observed limits combination of all channels

    Data from the right panel of Figure 6.

    10.17182/hepdata.89049.v1/t12

    Individual and combined dilepton (this analysis) and diphoton 95% CL observed exclusion limits as a summary of all parameter conventions...

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