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Relativistic and gauge independent off-shell corrections to the toponium decay width

1994; Elsevier BV; Volume: 430; Issue: 1 Linguagem: Inglês

10.1016/0550-3213(94)90647-5

ISSN

1873-1562

Autores

W. Mödritsch, Wolfgang Kummer,

Tópico(s)

High-Energy Particle Collisions Research

Resumo

Off-shell and relativistic bound-state corrections for the decay $t \to b+W$ are calculated to $O(\a_s^2)$ 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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