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Top-quark decay at next-to-next-to-leading order in QCD

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 W boson width effects. In particular, we also show the first results of the fully differential decay rat...

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Bibliographic Details
Published in:Physical review letters 2013-01, Vol.110 (4), p.042001-042001, Article 042001
Main Authors: Gao, Jun, Li, Chong Sheng, Zhu, Hua Xing
Format: Article
Language:English
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Summary: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 W boson width effects. In particular, we also show the first results of the fully differential decay rates for the top-quark semileptonic decay t → W(+)(l(+)ν)b 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.110.042001