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Last updated on 2026-01-05 10:54
Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A search for exotic Higgs boson decays $\mathrm{H} \to \mathcal{A} \mathcal{A}$, with $\mathcal{A} \to \gamma \gamma$ is presented, using events with a semi-merged topology. One of the hypothetical particles, $\mathcal{A}$, is assumed to decay promptly into a semi-merged diphoton system reconstructed as a single photon-like object, while the other $\mathcal{A}$ decays into two resolved photons. The search is performed using proton-proton collision data collected by the CMS experiment at $\sqrt{s} = 13$ TeV, corresponding to an integrated luminosity of $138~fb^{-1}$. The data agree with the standard model background expectation.Upper limits are set on the product of the Higgs boson production cross section and the branching fraction, $\sigma(\mathrm{pp} \to \mathrm{H})\,\mathcal{B}( \mathrm{H} \to \mathcal{A} \mathcal{A} \to 4\gamma)$, which range from 0.264 to 0.005$\,\mathrm{pb}$ at 95% confidence level, for $\mathcal{A}$ masses in the range $1 < m_\mathcal{A} < 15$ GeV. These limits are the most stringent to date in the 1--5 GeV $m_\mathcal{A}$ range.
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When using this data, please cite the original publication:
CMS
Collaboration
(2026).
Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV. CMS-EXO-24-025.
Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV. HEPData (collection).
https://doi.org/10.17182/hepdata.166011
or, if you prefer, a specific version of the
record:
CMS
Collaboration
(2026).
Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV (Version 1). HEPData (collection).
https://doi.org/10.17182/hepdata.166011.v1
You can also cite the 5 data
tables
or the 1 additional
resource
individually.
Data tables
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CMS
Collaboration
(2026).
“Figure 10 (upper): Unrolled 2D $m_{A}$ distribution” of “Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.166011.v1/t1
CMS
Collaboration
(2026).
“Figure 10 (lower left): $m_{A1}$ projection” of “Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.166011.v1/t2
CMS
Collaboration
(2026).
“Figure 10 (lower right): $m_{A2}$ projection” of “Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.166011.v1/t3
CMS
Collaboration
(2026).
“Figure 11: Observed and expected limits” of “Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.166011.v1/t4
CMS
Collaboration
(2026).
“Signal Cutflow” of “Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV” (Version 1). HEPData (dataset).
https://doi.org/10.17182/hepdata.166011.v1/t5
Additional resources
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CMS
Collaboration
(2026).
“CMS-EXO-24-025_MadgraphCards.tar.gz” of “Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV” (Version 1). HEPData (other).
https://doi.org/10.17182/hepdata.166011.v1/r1
When using this data, please cite the original publication:
CMS
Collaboration
(2026).
Search for exotic Higgs boson decays H $\to$$\mathcal{AA}$ with $\mathcal{AA}$$\to$$γγ$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV. CMS-EXO-24-025.
or, if you prefer, a specific version of the
record:
You can also cite the 5 data
tables
or the 1 additional
resource
individually.
Data tables
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Additional resources
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