Electroweak corrections to the top quark decay -: art. no. 017301

We calculate the one-loop electroweak corrections to the decay t --> bW(+), including the counterterm for the CKM matrix elements V-tb. Previous calculations used an incorrect deltaV(tb) that led to a gauge dependent amplitude. However, since the contribution stemming from deltaV(tb) is small, those calculations only underestimate the width by roughly 1 part in 10(5).