Second Order QCD Corrections to the Top Decay Rate
K. G. Chetyrkin, R. Harlander, T. Seidensticker, M. Steinhauser
Abstract
We report on a recent calculation of the top decay rate up to order αs2. It is based on asymptotic expansions of the off-shell top propagator, followed by a Padé approximation in order to reach the physically relevant point q2=Mt2.
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