The Top Quark Decay Vertex in Standard Model Extensions

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Bernreuther, Werner
Gonzalez, Patrick
Wiebusch, Martin
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Abstract
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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.
Comment: Latex, 27 pages, 14 figures
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High Energy Physics - Phenomenology
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