No signal was found in CMS data for H→AA→4γ in the semi-merged topology; new 95% CL upper limits are set at 0.264–0.005 pb for m_A = 1–15 GeV.
Jet reconstruction and performance using particle flow with the ATLAS detector
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Search for exotic Higgs boson decays H $\to$ $\mathcal{AA}$ with $\mathcal{AA}$ $\to$ $\gamma\gamma$ in events with a semi-merged topology in proton-proton collisions at $\sqrt{s}$ = 13 TeV
No signal was found in CMS data for H→AA→4γ in the semi-merged topology; new 95% CL upper limits are set at 0.264–0.005 pb for m_A = 1–15 GeV.