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Title: An anomalous Wtb coupling at a linear collider
Authors: Kołodziej, Karol
Keywords: quarks; production; top-quark mass
Issue Date: 2004
Citation: Physics Letters B, Vol. 584, iss. 1-2 (2004), s. 89-97
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 [Phys. Lett. B 476 (2000) 87; Phys. Lett. B 529 (2002) 82; Phys. Lett. B 557 (2003) 55; Pramana 54 (2000) 791, hep-ph/0002006] in the narrow top quark width approximation.
DOI: 10.1016/j.physletb.2004.01.017
ISSN: 0370-2693
Appears in Collections:Artykuły (WNŚiT)

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