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...

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Bibliographic Details
Published in:arXiv.org 2013-01
Main Authors: Gao, Jun, Chong Sheng Li, Hua Xing Zhu
Format: Article
Language:English
Subjects:
Decay rate
Field theory
Mass distribution
Quantum chromodynamics
Quarks
Online Access:Get full text
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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 top-quark semileptonic decay \(t\to W^+(l^+\nu)b\) 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:2331-8422
DOI:10.48550/arxiv.1210.2808