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arXiv · hep-ph/9906273

Second Order QCD Corrections to $Γ(t \to Wb)$

K. G. Chetyrkin·R. Harlander·T. Seidensticker·M. Steinhauser
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Abstract

Corrections of $O(α_s^2)$ to the decay of the top quark into a W boson and a bottom quark are calculated. The method is based on an expansion of the top quark propagator for small external momentum, q, as compared to the top quark mass, M_t. The physical point q^2 = M_t^2 is reached through Padé approximations. The described method allows to take effects induced by a finite W boson mass into account. The numerical relevance of the result is discussed. Important cross-checks against recent results for the decay rate $b \to u l \barν$ and the two-loop QED corrections to $μ$-decay are performed.

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K. G. Chetyrkin, R. Harlander, T. Seidensticker, M. Steinhauser. 1999-08-09. Second Order QCD Corrections to $Γ(t \to Wb)$. https://doi.org/10.1103/physrevd.60.114015

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