Gauge-Independent Bound-State Corrections to the Toponium Decay Width
W. Moedritsch, W. Kummer
Abstract
Off-shell and relativistic bound-state corrections for the decay t b+W are calculated to O(s2) making full use of the Bethe-Salpeter formalism for weakly bound systems. Thus we are able to take into account all terms to that order in a systematic and straightforward manner. One of the previously not considered contributions cancels precisely gauge dependent terms which appeared in an earlier off-shell calculation. Important cancellations also determine the gauge-independent part.
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