Abstract
We present the complete calculation of the top-quark decay width at next-to-next-to-leading order in QCD, including next-to-leading electroweak corrections as well as finite bottom quark mass and boson width effects. In particular, we also show the first results of the fully differential decay rates for the top-quark semileptonic decay at next-to-next-to-leading order in QCD. Our method is based on the understanding of the invariant mass distribution of the final-state jet in the singular limit from effective field theory. Our result can be used to study arbitrary infrared-safe observables of top-quark decay with the highest perturbative accuracy.
- Received 13 October 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.042001
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