Top-Quark Decay at Next-to-Next-to-Leading Order in QCD

Jun Gao, Chong Sheng Li, and Hua Xing Zhu
Phys. Rev. Lett. 110, 042001 – Published 24 January 2013

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 W boson width effects. In particular, we also show the first results of the fully differential decay rates for the top-quark semileptonic decay tW+(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.

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  • Received 13 October 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.042001

© 2013 American Physical Society

Authors & Affiliations

Jun Gao1,*, Chong Sheng Li2,3,†, and Hua Xing Zhu4,‡

  • 1Department of Physics, Southern Methodist University, Dallas, Texas 75275-0175, USA
  • 2Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
  • 3Center for High Energy Physics, Peking University, Beijing 100871, China
  • 4SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94309, USA

  • *jung@smu.edu
  • csli@pku.edu.cn
  • hxzhu@slac.stanford.edu

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Vol. 110, Iss. 4 — 25 January 2013

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