Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at $\sqrt{s} =$ 8 and 13 TeV

The CMS collaboration
Phys.Lett.B 793 (2019) 320-347, 2019.

Abstract
The results of a search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV decaying into two photons are presented. The analysis uses the data set collected with the CMS experiment in proton-proton collisions during the 2012 and 2016 LHC running periods. The data sample corresponds to an integrated luminosity of 19.7 (35.9) fb$^{-1}$ at $\sqrt{s} =$8 (13) TeV. The expected and observed 95% confidence level upper limits on the product of the cross section and branching fraction into two photons are presented. The observed upper limit for the 2012 (2016) data set ranges from 129 (161) fb to 31 (26) fb. The statistical combination of the results from the analyses of the two data sets in the common mass range between 80 and 110 GeV yields an upper limit on the product of the cross section and branching fraction, normalized to that for a standard model-like Higgs boson, ranging from 0.7 to 0.2, with two notable exceptions: one in the region around the Z boson peak, where the limit rises to 1.1, which may be due to the presence of Drell-Yan dielectron production where electrons could be misidentified as isolated photons, and a second due to an observed excess with respect to the standard model prediction, which is maximal for a mass hypothesis of 95.3 GeV with a local (global) significance of 2.8 (1.3) standard deviations.

  • Figure 4b

    Absolut limit from figure 4, located on page 13.

    10.17182/hepdata.91266.v1/t1

    Expected and observed exclusion limits (95% CL, in the asymptotic approximation) on the product of the production cross section and...

  • Figure 4a

    Absolut limit from figure 4, located on page 13.

    10.17182/hepdata.91266.v1/t2

    Expected and observed exclusion limits (95% CL, in the asymptotic approximation) on the product of the production cross section and...

  • Figure 5a

    Absolut limit from figure 5a, located on page 14.

    10.17182/hepdata.91266.v1/t3

    Expected and observed exclusion limits (95% CL, in the asymptotic approximation) on the product of the production cross section and...

  • Figure 5b

    Absolut limit from figure 5b, located on page 14.

    10.17182/hepdata.91266.v1/t4

    Expected and observed exclusion limits (95% CL, in the asymptotic approximation) on the product of the production cross section and...

  • Figure 5c

    Absolut limit from figure 5, located on page 14.

    10.17182/hepdata.91266.v1/t5

    Expected and observed exclusion limits (95% CL, in the asymptotic approximation) on the product of the production cross section and...

  • Figure 5d

    Absolut limit from figure 5, located on page 14.

    10.17182/hepdata.91266.v1/t6

    Expected and observed exclusion limits (95% CL, in the asymptotic approximation) on the product of the production cross section and...

  • Figure 6

    Normalized limit from figure 6, located on page 15.

    10.17182/hepdata.91266.v1/t7

    Expected and observed exclusion limits (95% CL, in the asymptotic approximation) on the product of the production cross section and...

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