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Search for exotic Higgs boson decays H → 𝒜𝒜 with 𝒜 → γγ in events with a semi-merged topology in proton-proton collisions at $ \sqrt{s}=13 $ TeV

CMS Collaboration; Hayrapetyan, A.; Makarenko, V.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Benato, L.; Bergauer, T.; Dragicevic, M.; Giordano, C.; Hussain, P. S.; Jeitler, M.; Krammer, N.; Li, A.; Liko, D.; Matthewman, M.; Mikulec, I.; Schieck, J.; Schöfbeck, R.; ... mehr

Abstract:

A search for exotic Higgs boson decays H → 𝒜𝒜, with 𝒜 → γγ is presented, using events with a semi-merged topology. One of the hypothetical particles, 𝒜, is assumed to decay promptly into a semi-merged diphoton system reconstructed as a single photon-like object, while the other 𝒜 decays into two resolved photons. The search is performed using proton-proton collision data collected by the CMS experiment at $\sqrt{s}$ = 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, σ(pp → H) ℬ(H → 𝒜𝒜 → 4γ), which range from 0.264 to 0.005 pb at 95% confidence level, for 𝒜 masses in the range 1 < m$_𝒜$ < 15 GeV. These limits are the most stringent to date in the 1–5 GeV m$_{𝒜}$ range.


Verlagsausgabe §
DOI: 10.5445/IR/1000196562
Veröffentlicht am 02.11.2026
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Scientific Computing Center (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2026
Sprache Englisch
Identifikator ISSN: 1029-8479, 1126-6708, 1127-2236
KITopen-ID: 1000196562
Erschienen in Journal of High Energy Physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2026
Heft 7
Seiten Art.Nr: 119
Vorab online veröffentlicht am 13.07.2026
Externe Relationen Siehe auch
Schlagwörter Beyond Standard Model, Hadron-Hadron Scattering, Higgs Physics, Photon Production
Nachgewiesen in OpenAlex
Scopus
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