https://doi.org/10.1140/epjc/s10052-009-0887-4
Regular Article - Theoretical Physics
The top-quark decay vertex in standard model extensions
Institut für Theoretische Physik, RWTH Aachen University, 52056, Aachen, Germany
* e-mail: breuther@physik.rwth-aachen.de
Received:
12
December
2008
Revised:
8
January
2009
Published online:
14
February
2009
New physics interactions can affect the strength and structure of the tbW vertex. We investigate the magnitudes and phases of “anomalous” contributions to this vertex in a two-Higgs doublet and the minimal supersymmetric extension of the standard model, and in a top-color assisted technicolor (TC2) model. While the magnitudes of the anomalous couplings remain below 1 percent in the first two models, TC2 interactions can reduce the left-chiral coupling f L by several percent.
PACS: 11.30.Er – / 12.60.-i – / 14.65.Ha –
© Springer-Verlag , 2009
