Abstract
We calculate QED and quantum-chromodynamics (QCD) radiative corrections to the fermionic decays of the Higgs boson, and . A novel feature of the calculation is that renormalization introduces logarithms of the fermion mass into the total decay rate. The order- QED corrections suppress the decay rate by a few percent. The order-, QCD corrections to the hadronic decay rate for a heavy Higgs boson are large, and lowestorder perturbation theory is useful only for quantities in which the logarithms of the quark mass cancel, such as . We obtain reliable corrections to the decay rate by summing the QCD corrections to all orders in the leading-logarithm approximation. The result has a simple interpretation in terms of the "running mass" of the renormalization group: The effective quark-Higgs-boson coupling is proportional to the running mass of the quark evaluated at the Higgs-boson mass.
- Received 25 February 1980
DOI:https://doi.org/10.1103/PhysRevD.22.715
©1980 American Physical Society