Search for new physics in high-mass diphoton events from proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-EXO-22-024, 2024.

Abstract
Results are presented from a search for new physics in high-mass diphoton events from proton-proton collisions at $\sqrt{s}$ = 13 TeV. The data set was collected in 2016-2018 with the CMS detector at the LHC and corresponds to an integrated luminosity of 138 fb$^{-1}$. Events with a diphoton invariant mass greater than 500\GeV are considered. Two different techniques are used to predict the standard model backgrounds: parametric fits to the smoothly-falling background and a first-principles calculation of the standard model diphoton spectrum at next-to-next-to-leading order in perturbative quantum chromodynamics calculations. The first technique is sensitive to resonant excesses while the second technique can identify broad differences in the invariant mass shape. The data are used to constrain the production of heavy Higgs bosons, Randall-Sundrum gravitons, the large extra dimensions model of Arkani-Hamed, Dimopoulos, and Dvali (ADD), and the continuum clockwork mechanism. No statistically significant excess is observed. The present results are the strongest limits to date on ADD extra dimensions and RS gravitons with a coupling parameter greater than 0.1.

  • Fig. 1 eff x Acc

    Data from Figure 1 located on page 5.

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    The product of the event selection efficiency (e) and the detector acceptance (A) is shown as a function of the...

  • Fig. 2 bkg fit EBEB

    Data from Figure 2 right located on page 8.

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    Figure 2: Observed diphoton invariant mass spectra for the EBEB category for the full Run 2 data set are shown....

  • Fig. 2 bkg fit EBEE

    Data from Figure 2 right located on page 8.

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    Figure 2: Observed diphoton invariant mass spectra for the EBEE category for the full Run 2 data set are shown....

  • Fig. 3a J=2 ~k=0.01 limits

    Data from Figure 3 (top left) located on page 9.

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    Figure 3 top left. Expected and observed 95% CL upper limits on the product of the production cross section and...

  • Fig. 3b J=0 width 0.014 limits

    Data from Figure 3 (top right) located on page 9.

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    Figure 3 top right. Expected and observed 95% CL upper limits on the product of the production cross section and...

  • Fig. 3c J=2 ~k=0.1 limits

    Data from Figure 3 (mid left) located on page 9.

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    Figure 3 mid left. Expected and observed 95% CL upper limits on the product of the production cross section and...

  • Fig. 3d J=0 width 1.4 limits

    Data from Figure 3 (mid right) located on page 9.

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    Figure 3 mid right. Expected and observed 95% CL upper limits on the product of the production cross section and...

  • Fig. 3e J=2 ~k=0.2 limits

    Data from Figure 3 (bottom left) located on page 9.

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    Figure 3 bottom left. Expected and observed 95% CL upper limits on the product of the production cross section and...

  • Fig. 3f J=0 width 5.6 limits

    Data from Figure 3 (bottom right) located on page 9.

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    Figure 3 bottom right. Expected and observed 95% CL upper limits on the product of the production cross section and...

  • Fig. 4a Expected J=2 2D limits

    Data from Figure 4 (top left) located on page 10.

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    Figure 4 top left. Expected 95% CL upper limits on the product of the cross section and branching fraction as...

  • Fig. 4b Observed J=2 2D limits

    Data from Figure 4 (top right) located on page 10.

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    Figure 4 top right. Observed 95% CL upper limits on the product of the cross section and branching fraction as...

  • Fig. 4c Expected J=0 2D limits

    Data from Figure 4 (bottom left) located on page 10.

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    Figure 4 bottom left. Expected 95% CL upper limits on the product of the cross section and branching fraction as...

  • Fig. 4d Observed J=0 2D limits

    Data from Figure 4 (bottom right) located on page 10.

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    Figure 4 bottom right. Observed 95% CL upper limits on the product of the cross section and branching fraction as...

  • Fig. 6 Mgg EBEB

    Data from Figure 6 located on page 11.

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    Figure 6. The $m_{\gamma\gamma}$ spectra and background prediction after nuisance paramter marginalization (post-fit) due to SM diphoton production ($\gamma\gamma$) and...

  • Fig. 6 Mgg EBEE

    Data from Figure 6 located on page 11.

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    Figure 6. The $m_{\gamma\gamma}$ spectra and background prediction after nuisance paramter marginalization (post-fit) due to SM diphoton production ($\gamma\gamma$) and...

  • Fig. 7 CWk limits

    Data from Figure 7 located on page 12.

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    Figure 7. The exclusion limit for the clockwork framework over the k--M5 parameter space. The shaded region denotes where the...

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