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| CMS-PAS-HIG-19-014 | ||
| Search for the Higgs boson decay to Z$ \gamma $ in proton-proton collisions at $\sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| October 2021 | ||
| Abstract: Results are presented from a search for the Higgs boson decay $\mathrm{H}\to\mathrm{Z}\gamma$, where $\mathrm{Z}\to\ell^+\ell^-$ with $\ell= $ e or $\mu$. This search is performed using a sample of proton-proton collision data at a center-of-mass energy of 13 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 137 fb$^{-1}$. Events are assigned to mutually exclusive categories, which exploit differences in event topology and kinematics of distinct Higgs production modes to enhance signal sensitivity. To detect a potential signal, fits are performed to the distributions of $m_{\ell^+\ell^-\gamma}$ in each of these categories simultaneously. The observed (expected) upper limit at 95% confidence level on the signal strength $\mu$, defined as the product of the cross section and the branching fraction [$\sigma(\mathrm{pp}\to\mathrm{H})\times\,\mathcal{B}(\mathrm{H}\to\mathrm{Z}\gamma)$], relative to the standard model expectation, is 4.1 (1.8). The best fit value of the signal strength is found to be $\mu=$ 2.4 $\pm$ 0.9, corresponding to $\sigma(\mathrm{pp}\to\mathrm{H})\times\,\mathcal{B}(\mathrm{H}\to\mathrm{Z}\gamma)=$ 0.21 $\pm$ 0.08 pb. The statistical significance of the observed excess of events under the background-only hypothesis is 2.7 standard deviations at $m_\mathrm{H}= $ 125.38 GeV. | ||
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Links:
CDS record (PDF) ;
Physics Briefing ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 05 (2023) 233. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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