"Thedecay widths have higher-order perturbative QCD corrections, and these are particularly important for the
decay which dominates over a wide range of (light) Higgs masses. The main effect is to cause the quark mass
to run from its "constituent quark" value at
to a lower value at
."
R. Ellis, W. Stirling, and B. Webber, "QCD and Collider Physics", Cambridge UP 1996.
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