A search for exotic Higgs boson decays H â AA, with A â YY 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 s=13 TeV, corresponding to an integrated luminosity of 138 fbâ1. 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, Ï(pp â H) B(H â AA â 4Îł), which range from 0.264 to 0.005 pb at 95% confidence level, for A masses in the range 1 < mA< 15 GeV. These limits are the most stringent to date in the 1â5 GeV mA range.
Search for exotic Higgs boson decays H â đđ with đ â γγ in events with a semi-merged topology in proton-proton collisions at âs =13 TeV
Alexe, C.;Bruschini, D.;Ligabue, F.;
2025
Abstract
A search for exotic Higgs boson decays H â AA, with A â YY 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 s=13 TeV, corresponding to an integrated luminosity of 138 fbâ1. 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, Ï(pp â H) B(H â AA â 4Îł), which range from 0.264 to 0.005 pb at 95% confidence level, for A masses in the range 1 < mA< 15 GeV. These limits are the most stringent to date in the 1â5 GeV mA range.| File | Dimensione | Formato | |
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JHEP07(2026)119.pdf
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