Hadronic Higgs Decay to Order α 4 s

Status of Perturbative Qcd Evaluation of Hadronic Decay Rates of the Z and Higgs Bosons

We review the current status of the high order perturbative QCD evaluation of the hadronic decay rates of the Z and Higgs bosons. A systematic classification of the various types of QCD corrections to O(α 2 s) and O(α 3 s) is made and their numerical status is clarified.

Complete QCD Corrections of Order O ( α 3 s ) to the Hadronic Higgs Decay

Higher Order Corrections to the Hadronic Higgs Decay ∗

A Higgs boson in the intermediate mass range is considered. An effective Lagrangian approach is used in order to evaluate the top-induced QCD corrections of order α s to the decay into light quarks and O(α s ) corrections to the gluonic decay mode. The connection to the decoupling relations for αs and the light quark masses is discussed. The Higgs boson is the only still missing particle in the...

Perturbative QCD Corrections to the Z Boson Width and the Higgs Decay Rate

Radiative QCD corrections significantly influence the theoretical predictions for the decay rates of the Z and the Higgs boson. The status of the QCD calculations to the hadronic Z width is reviewed. The role of mass corrections from bottom quark final states is emphasized. An estimate of the theoretical uncertainties is given. New results for quar-tic mass terms of order O(α 2 s) are presented...

QCD Corrections to Hadronic Z and τ Decays ⋆

We present a brief (mainly bibliographical) report on recently performed calculations of terms of order O(α 4 s n 2 f) and O(α 4 s n 2 f m 2 q) for hadronic Z and τ decay rates. A few details about the analytical evaluation of the masters integrals appearing in the course of calculations are presented.