CMS-PAS-HIG-15-012

CMS-PAS-HIG-15-012
A combination of searches for the invisible decays of the Higgs boson using the CMS detector
CMS Collaboration
September 2015

Abstract: Searches for invisible decays of the Higgs boson using Run 1 proton-proton collision data from the CMS experiment at the LHC are combined. The searches cover a wide range of Higgs boson production modes namely gluon fusion, vector boson fusion and vector boson associated production. The data samples used were collected in 2011 and 2012 and correspond to integrated luminosities of up to 4.9 fb$^{-1}$ at 7 TeV and up to 19.7 fb$^{-1}$ at 8 TeV. Data, in all channels, are consistent with the expected standard model backgrounds. Assuming standard model Higgs boson cross sections and corresponding detector acceptances, limits are set on the invisible branching fraction for each production mode separately and for the full combination of all channels. From the combination of all channels, we set an observed (expected) upper limit on the invisible branching fraction for $m_{\mathrm{H}} = $ 125 GeV to be 36% (30%) at 95% confidence level.
Links: CDS record (PDF) ; inSPIRE record ; Public twiki page ; CADI line (restricted) ;

Summary	CMS Publications

Summary

The CMS searches for invisible decays of Higgs bosons using data from Run 1 of the LHC have been combined. The searches target the VBF, VH and ggH production modes. The observation in data shows no significant difference compared to the expectation from SM backgrounds in all channels. Using the CLs method and assuming SM production cross sections and corresponding detector acceptances we set upper limits on the invisible branching fraction of the Higgs boson for each channel separately, for the combination of all channels contributing to each Higgs boson production mode and for the combination of all channels. The observed (expected) upper limit set on the Higgs boson invisible branching fraction for $m_{\mathrm{H}} =$ 125 GeV is 36 (30)%, at 95% confidence level.