Search for new physics in events with a leptonically decaying Z boson and a large transverse momentum imbalance in proton–proton collisions at $\sqrt{s} $ = 13 $\,\text {TeV}$

The CMS collaboration
Eur.Phys.J. C78 (2018) 291, 2018

Abstract (data abstract)
A search for new physics in events with a Z boson produced in association with large missing transverse momentum at the LHC is presented.The search is based on the 2016 data sample of proton-proton collisions recorded with the CMS experiment at $\sqrt{s} = 13$ TeV,corresponding to an integrated luminosity of 35.9 fb$^{-1}$.The results of this search are interpreted in terms of a simplified model of dark matter production via spin-0 or spin-1 mediators,a scenario with a standard-model-like Higgs boson produced in association with the Z boson and decaying invisibly,a model of unparticle production, and a model with large extra spatial dimensions.No significant deviations from the background expectations are found, and limits are set on relevant model parameters, significantly extending the results previously achieved in this channel.

  • Event yields in the signal region

    Data from Table 4.

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    Expected event yields in each $p_{\mathrm{T}}^{\mathrm{miss}}$ bin for the sum of background processes in the signal region (SR). The background...

  • DM limit (vector mediator)

    Data from Figure 5 (left).

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    Limit on the signal strength of the DM signal in a simplified model with a vector mediator.

  • DM limit (axial mediator)

    Data from Figure 5 (right).

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    Limit on the signal strength of the DM signal in a simplified model with an axial-vector mediator.

  • DM limit (scalar mediator)

    Data from Figure 6.

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    Limit on the signal strength of the DM signal in a simplified model with a scalar mediator.

  • DM limit (pseudoscalar mediator)

    Data from Figure 6.

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    Limit on the signal strength of the DM signal in a simplified model with a pseudoscalar mediator.

  • Higgs invisible limits

    Data from Figure 9.

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    Expected and observed 95% CL upper limits on the product of the production cross section and the branching fraction, $\sigma$(qq...

  • Unparticle Limits

    Data from Figure 10.

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    The 95% CL upper limits on the Wilson coefficient $\lambda(1\mathrm{TeV} / \Lambda_{U})^{d_{U}-1}$ of the unparticle-quark coupling operator.

  • ADD Limits

    Data from Figure 11 (right).

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    The 95% CL lower limits on the reduced Planck mass $M_{D}$ as a function of the number of extra dimensions...

  • Bin covariance matrix

    Data from Figure 12.

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    The covariance matrix of the bin contents of the background fit. Because the matrix is symmetric by definiton, only the...

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