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Neutral flavor-changing transitions are hugely suppressed in the StandardModel and therefore they are very sensitive to new physics. We consider thedecay rate of t->u_i h where u_i=u,c using an effective field theory approach.We perform the calculation at NLO in QCD including the relevant dimension-sixoperators. We find that at NLO the contribution from the flavor-changingchromomagnetic operator is as important as the standard QCD correction to theflavor-changing Yukawa coupling. In addition to improving the accuracy of thetheoretical predictions, the NLO calculation provides information on theoperator mixing under the renormalization group.

Top-quark decay into Higgs boson and a light quark at next-to-leading order in QCD