An anomalous Wtb coupling at a linear collider

Abstract

Differential cross sections of secondary particles in a process of top quark pair production and decay into six fermions at a linear collider with an unpolarized and a longitudinally polarized electron beam are computed to the lowest order in the standard model and in the presence of an anomalous Wtb coupling. It is illustrated that the latter has a little impact on the differential cross sections. In particular, it is shown that the angular distribution of a secondary lepton receives practically no contribution from the anomalous Wtb coupling, even if the top quark is produced off shell and the non-double resonance background contributions are taken into account. This finding is in accordance with the decoupling theorem that has been proven in literature in the narrow top quark width approximation.

11 pages, 9 figures, axodraw.sty

References in corpus (4)

• Decoupling of Anomalous Top-Quark-Decay Vertices in Angular Distribution of Secondary Particles
• Angular Distribution of Leptons in General ttbar Production and Decay
• Higgs studies in ACFA Linear Collider Working Group
• eett6f v. 1.0, A program for top quark pair production and decay into 6 fermions at linear colliders

Cited by in corpus (6)

• Anomalous Wtb couplings in gamma-proton collision at the LHC
• Secondary particles spectra in the decay of a polarized top quark with anomalous $tWb$ coupling
• 'carlomat', version 2 of the program for automatic computation of lowest order cross sections
• Anomalous Wtb coupling and forward-backward asymmetry of top quark production at the Tevatron
• Single top production at linear $e^{-}{e}^{+}$ colliders
• Associated Production of Single Top Quark and W-boson Through Anomalous Couplings at LHeC based $\gamma p$ Colliders