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Search for the decay of a Higgs boson in the $\ell\ell\gamma$ channel in proton-proton collisions at $\sqrt{s}=$ 13 TeV

The CMS collaboration
Sirunyan, Albert M. , Tumasyan, Armen , Adam, Wolfgang , Ambrogi, Federico , Asilar, Ece , Bergauer, Thomas , Brandstetter, Johannes , Brondolin, Erica , Dragicevic, Marko , Erö, Janos
JHEP 11 (2018) 152, 2018.
https://doi.org/10.17182/hepdata.86538.v1

Abstract (data abstract)
A search for a Higgs boson decaying into a pair of electrons or muons and a photon is described. Higgs boson decays to a Z boson and a photon $(H\rightarrow Z\gamma\rightarrow ll\gamma, l = e \text{ or } \mu)$, or to two photons, one of which has an internal conversion into a muon pair $(H\rightarrow\gamma^{*}\gamma\rightarrow\mu\mu\gamma)$ were considered. The analysis is performed using a data set recorded by the CMS experiment at the LHC from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. No significant excess above the background prediction has been found. Limits are set on the cross section for a standard model Higgs boson decaying to opposite-sign electron or muon pairs and a photon. The observed limits on cross section times the corresponding branching fractions vary between 1.4 and 4.0 (6.1 and 11.4) times the standard model cross section for $H\rightarrow\gamma^{*}\gamma\rightarrow\mu\mu\gamma$ $(H\rightarrow Z\gamma\rightarrow ll\gamma)$ in the 120-130 GeV mass range of the $ll\gamma$ system. The $H\rightarrow\gamma^{*}\gamma\rightarrow\mu\mu\gamma$ and $H\rightarrow Z\gamma\rightarrow ll\gamma$ analyses are combined for $m_{H} = 125$ GeV, obtaining an observed (expected) 95% condifence level upper limit of 3.9 (2.0) times the standard model cross section.

  • Figure 6a ($H\rightarrow\gamma^{*}\gamma$ Limits)

    Contents of Figure 6 (upper plot).

    10.17182/hepdata.86538.v1/t1

    Exclusion limit, at 95% CL, on the cross section of the $H \rightarrow \gamma^{*}\gamma \rightarrow \mu\mu\gamma$ process relative to the...

  • Figure 6b ($H\rightarrow Z\gamma$ Limits)

    Contents of Figure 6 (lower plot).

    10.17182/hepdata.86538.v1/t2

    Exclusion limit, at 95% CL, on the cross section of the $H \rightarrow Z\gamma \rightarrow ll\gamma$ process relative to the...

  • Figure 7 ($H\rightarrow ll\gamma$ Limits)

    Contents of Figure 7.

    10.17182/hepdata.86538.v1/t3

    Exclusion limit, at 95% CL, on the cross section of the $H \rightarrow ll\gamma$ relative to the SM prediction, for...

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