• DOI:10.1007/BF01571710
• Corpus ID: 120688135

Effective gauge theory and the effect of heavy quarks in Higgs boson decays

@article{Inami1983EffectiveGT,
  title={Effective gauge theory and the effect of heavy quarks in Higgs boson decays},
  author={Takeo Inami and Takahiro Kubota and Yasuhiro Okada},
  journal={Zeitschrift f{\"u}r Physik C Particles and Fields},
  year={1983},
  volume={18},
  pages={69-80}
}

• T. Inami, T. Kubota, Y. Okada
• Published 1 March 1983
• Physics
• Zeitschrift für Physik C Particles and Fields

A general framework is given for evaluating the contributions of as yet undiscovered heavy quarks to the gluonic decay rate of the Weinberg-Salam type Higgs boson. Since the Yukawa coupling of the Higgs boson to a quark pair is proportional to the quark mass, loop graphs involving heavy quarks have a non-vanishing effect on the gluonic decay width of the Higgs boson. This effect of heavy quarks with massesMj(j=t,...) much greater than the Higgs boson massmH is calculated in an effective gauge theory. The effects of two different kinds of large logarithms, lnMj2/μmh2/μ2 are separated and summed up by the renormalization group method. It is found that the higher order QCD corrections are large and that the gluonic contribution to the hadronic decay width is significant if there are more than three generations. The Higgs decay width can therefore be used to probe the number of generations of heavy quarks.