Probe of the Wtb coupling in $t \bar t$ pair production at Linear Colliders

Details Probe of the Wtb coupling in $t \bar t$ pair production at Linear Colliders Probe of the Wtb coupling in $t \bar t$ pair production at Linear Colliders

2000-01-06

arxiv.org/abs/hep-ph/0001048v2

Eur.Phys.J.C16:269-278,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 6 figures, uses axodraw.sty

Scientific paper

10.1007/s100520050019

The Wtb vertex can be probed on future colliders in the processes of single top production (LHC, pp mode, NLC, $\gamma e$ mode) and of top pair production (NLC, e^+ e^- mode). We analyse observables sensitive to anomalous Wtb couplings in the top pair production process of e^+ e^- collisions. In particular, forward-backward and spin-spin asymmetries of the top decay products and the asymmetry of the lepton energy spectum are considered. Possible bounds on anomalous couplings obtained are competitive to those expected from the upgraded Tevatron and LHC. The validity of the infinitely small width approximation for the three-body top decay is also studied in detail.

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