Search for the decay of a Higgs boson in the ℓℓγ channel in proton-proton collisions at $$ \sqrt{s}=13 $$ TeV
A search for a Higgs boson decaying into a pair of electrons or muons and a photon is described. Higgs boson decays to a Z boson and a photon (H $$\to$$ Z$$\gamma\to\ell\ell\gamma$$, $$\ell =$$ e or $$\mu$$), or to two photons, one of which has an internal conversion into a muon pair (H $$\to\gamma^{*}\gamma\to\mu\mu\gamma$$) were considered. The analysis is performed using a data set recorded by the CMS experiment at the LHC from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb$$^{-1}$$. No significant excess above the background prediction has been found. Limits are set on the cross section for a standard model Higgs boson decaying to opposite-sign electron or muon pairs and a photon. The observed limits on cross section times the corresponding branching fractions vary between 1.4 and 4.0 (6.1 and 11.4) times the standard model cross section for H $$\to\gamma^{*}\gamma\to\mu\mu\gamma$$ (H $$\to$$ Z$$\gamma\to\ell\ell\gamma$$) in the 120-130 GeV mass range of the $$\ell\ell\gamma$$ system. The H $$\to\gamma^*\gamma\to\mu\mu\gamma$$ and H $$\to$$ Z$$\gamma\to\ell\ell\gamma$$ analyses are combined for $$m_\mathrm{H} =$$ 125 GeV, obtaining an observed (expected) 95% confidence level upper limit of 3.9 (2.0) times the standard model cross section.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- Contributing Organization:
- The CMS collaboration
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1462211
- Report Number(s):
- CERN-EP--2018-092; CMS-HIG--17-007; FERMILAB-PUB--18-350-CMS; arXiv:1806.05996; 1678088
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 11 Vol. 2018; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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journal | October 2019 |
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