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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Field Theory

Background:

  • The Standard Model of particle physics describes fundamental particles and forces.
  • The Higgs boson, responsible for mass, interacts with other particles.
  • Understanding Higgs boson production mechanisms is crucial for testing the Standard Model.

Purpose of the Study:

  • To report the observation of Higgs boson production in association with a top quark-antiquark pair.
  • To combine results from various decay channels to enhance sensitivity.
  • To precisely measure the signal strength of this process.

Main Methods:

  • Analysis of proton-proton collision data collected by the CMS detector at the CERN Large Hadron Collider.
  • Utilized data at center-of-mass energies of 7, 8, and 13 TeV.
  • Combined statistically independent searches for Higgs boson decays to W bosons, Z bosons, photons, tau leptons, and bottom quark jets.

Main Results:

  • Observed an excess of events with a significance of 5.2 standard deviations above the background-only hypothesis.
  • The expected Standard Model significance for a Higgs boson mass of 125.09 GeV is 4.2 standard deviations.
  • The combined best fit signal strength is 1.26, normalized to the Standard Model prediction, with uncertainties of -0.26 and +0.31.

Conclusions:

  • The associated production of a Higgs boson with a top quark-antiquark pair is experimentally observed.
  • The measured signal strength is consistent with the Standard Model prediction.
  • This observation provides further validation of the Standard Model and enhances our knowledge of Higgs boson properties.