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| CMS-PAS-HIG-25-010 | ||
| Search for the rare Higgs boson decay $ \mathrm{H}\to\mathrm{Z}\gamma $ in proton-proton collisions at $ \sqrt{s}= $ 13 and 13.6 TeV | ||
| CMS Collaboration | ||
| 2026-04-07 | ||
| Abstract: A search is presented for the rare Higgs boson decay $ \mathrm{H}\to\mathrm{Z}\gamma $, where $ \mathrm{Z}\to \ell^{+}\ell^{-} $ and $ \ell^{\pm} = \mathrm{e}^{\pm} $ or $ \mu^{\pm} $. The search is performed using a sample of proton-proton (pp) collision data at the center-of-mass energies of 13 and 13.6 TeV, recorded by the CMS experiment at the LHC and corresponding to a total integrated luminosity of 200 $ \mathrm{fb}^{-1} $. The analysis design separately considers and optimizes sensitivity to Higgs boson production via gluon-gluon fusion, vector-boson fusion, and associated-production processes. The signal is extracted from a combined fit to the invariant mass distributions of the $ \ell^+\ell^-\gamma $ system in the various production channels and event categories. The observed (expected) signal strength $ \mu $, defined as the ratio of the measured value of $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{H})B(\mathrm{H}\to\mathrm{Z}\gamma) $ to the corresponding value predicted in the standard model, is found to be $ \mu = $ 1.10 $ ^{+0.52}_{-0.61} $ (1.00 $^{+0.49}_{-0.46}$) for a Higgs boson mass of $ m_{\mathrm{H}} = $ 125.38 GeV. The signal has an observed (expected) significance of 1.9 (2.3) standard deviations. | ||
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Links:
CDS record (PDF) ;
Physics Briefing ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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