Search for dark photons in decays of Higgs bosons produced in association with Z bosons in proton-proton collisions at $\sqrt{s}=$ 13 TeV

The CMS collaboration

Abstract (data abstract)
A search is presented for decays of a Higgs boson to an invisible particle together with an isolated photon, using the CMS experiment at the Large Hadron Collider. The Higgs boson is produced in association with a Z boson. The analysis is performed using a dataset recorded in 2016-18 corresponding to an integrated luminosity of 137 fb-1, at a center-of-mass energy of 13 TeV. No significant excess of events above the standard model expectation is found, and the results are interpreted to place limits on the cross section times branching fraction of such decays of the Higgs boson.

  • Table 2

    Data from Table 2


    Observed yields, background estimates after the fit to data, and signal predictions after the event selection in the signal region....

  • Table cut flow

    Supplementary material


    Expected yields for different processes after several selection stages. The preselection requires two leptons and at least one photon with...

  • Table limits

    Data from Figure 4


    Expected and observed upper limits at 95\% confidence level on the product of $\sigma_{\mathrm{\mathrm{ZH}}}$ and $\mathcal{B}$($\mathrm{H}$ -> $\mathrm{invisible}+\gamma$) as a...

  • Figure 2a

    Data from Figure 2a


    $\mathrm{M_{\mathrm{T}}}$ distribution for the $\mathrm{e}\mu$ control region.

  • Figure 2b

    Data from Figure 2b


    $\mathrm{M_{\mathrm{T}}}$ distribution for the WZ control region.

  • Figure 2c

    Data from Figure 2c


    $\mathrm{M_{\mathrm{T}}}$ distribution for the ZZ control region.

  • Figure 3a

    Data from Figure 3a


    $\mathrm{M_{\mathrm{T}}}$ distribution for the signal region, events with $|\eta_{\gamma}|<1$.

  • Figure 3b

    Data from Figure 3b


    $\mathrm{M_{\mathrm{T}}}$ distribution for the signal region, events with $|\eta_{\gamma}|>1$.

  • Muon efficiency

    Supplementary material


    Muon reconstruction, identification, and isolation efficiency as a function of $|\eta|$ and $\mathrm{p_\mathrm{T}}$.

  • Electron efficiency

    Supplementary material


    Electron reconstruction, identification, and isolation efficiency as a function of $|\eta|$ and $\mathrm{p_\mathrm{T}}$.

  • Photon efficiency

    Supplementary material


    Photon efficiency as a function of $|\eta|$ and $\mathrm{p_\mathrm{T}}$.

  • Covariance Matrix

    Supplementary material


    Covariance matrix for all bins used in the analysis. There are 45 bins in total, 15 for every data-taking year....

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