Published January 1, 2016 | Version v1
Journal article Open

Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC pp collision data at root s=7 and 8 TeV

Creators

  • 1. Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA
  • 2. Univ Iowa, Iowa City, IA USA
  • 3. Azerbaijan Acad Sci, Inst Phys, Baku, Azerbaijan
  • 4. Univ Paris Sud, Univ Paris Saclay, LAL, CNRS IN2P3, Orsay, France
  • 5. Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA
  • 6. Univ Sussex, Dept Phys & Astron, Brighton, E Sussex, England
  • 7. Tel Aviv Univ, Raymond & Beverly Sackler Sch Phys & Astron, Tel Aviv, Israel
  • 8. Technion Israel Inst Technol, Dept Phys, Haifa, Israel
  • 9. Univ Oregon, Ctr High Energy Phys, Eugene, OR 97403 USA
  • 10. AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Krakow, Poland
  • 11. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
  • 12. Northern Illinois Univ, Dept Phys, De Kalb, IL USA
  • 13. Ludwig Maximilians Univ Munchen, Fak Phys, Munich, Germany
  • 14. Rutherford Appleton Lab, Particle Phys Dept, Didcot, Oxon, England
  • 15. Univ Liverpool, Oliver Lodge Lab, Liverpool, Merseyside, England
  • 16. Univ Belgrade, Inst Phys, Belgrade, Serbia

Description

Combined ATLAS and CMS measurements of the Higgs boson production and decay rates, as well as constraints on its couplings to vector bosons and fermions, are presented. The combination is based on the analysis of five production processes, namely gluon fusion, vector boson fusion, and associated production with a W or a Z boson or a pair of top quarks, and of the six decay modes H -> ZZ; WW, gamma gamma; tau tau; bb, and mu mu. All results are reported assuming a value of 125: 09 GeV for the Higgs boson mass, the result of the combined measurement by the ATLAS and CMS experiments. The analysis uses the CERN LHC proton-proton collision data recorded by the ATLAS and CMS experiments in 2011 and 2012, corresponding to integrated luminosities per experiment of approximately 5 fb(-1) at root s = 7TeV and 20 fb(-1) at root s = 8TeV. The Higgs boson production and decay rates measured by the two experiments are combined within the context of three generic parameterisations: two based on cross sections and branching fractions, and one on ratios of coupling modifiers. Several interpretations of the measurements with more model-dependent parameterisations are also given. The combined signal yield relative to the Standard Model prediction is measured to be 1.09 +/- 0.11. The combined measurements lead to observed significances for the vector boson fusion production process and for the H -> tau tau decay of 5.4 and 5.5 standard deviations, respectively. The data are consistent with the Standard Model predictions for all parameterisations considered.

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