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arXiv 0812.1643hep-ph
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标准模型扩展中的顶夸克衰变顶点

The Top Quark Decay Vertex in Standard Model Extensions

Werner Bernreuther, Patrick Gonzalez, Martin Wiebusch

摘要:

新的物理相互作用可以影响$tbW$顶点的强度和结构。我们调查的幅度和相位的“异常”的贡献,这个顶点中的两个希格斯偶极子和最小的超对称扩展的标准模型,并在顶色辅助人工色(TC 2)模型。虽然在前两个模型中异常耦合的幅度保持在1%以下,但TC 2相互作用可以使左手性耦合$f_L$降低几个百分点。

英文摘要:

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.

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