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Observation of the SM scalar boson decaying to a pair of τ\tau leptons with the CMS experiment at the LHC

Collaboration
2017
38 pages
Report number:
  • CMS-PAS-HIG-16-043
Experiments:
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Abstract:
A search for a standard model scalar boson decaying into a pair of τ\tau leptons is performed using events recorded in proton-proton collisions by the CMS experiment at the LHC in 2016. The dataset corresponds to an integrated luminosity of s=13 TeV\sqrt{s}=13~\mathrm{TeV} at a center-of-mass energy of s=13 TeV\sqrt{s}=13~\mathrm{TeV}. The τ\tau leptons decay semi-hadronically, or leptonically to an electron or a muon, and the four final states with the largest branching fractions are considered. An excess of events is observed over the expected background prediction with a significance of 4.9 standard deviations for the scalar boson mass mH=125m_{H} = 125 GeV, to be compared to an expected significance of 4.7 standard deviations. The best fit of the observed H→ττH \to \tau \tau signal cross section times branching fraction for mH=125m_{H}= 125 GeV is 1.06−0.24+0.251.06^{+0.25}_{-0.24} times the standard model expectation.
Note:
  • Preliminary results
  • Data
  • p p: scattering
  • p p: colliding beams
  • Higgs particle: hadroproduction
  • Higgs particle: leptonic decay
  • tau: pair production
  • tau: leptonic decay
  • tau: hadronic decay
  • boson: scalar
  • Higgs particle: mass
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