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arXiv 1908.06226hep-ph
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普适额外维对顶夸克电磁相互作用的影响

Effects of universal extra dimensions on top-quark electromagnetic interactions

Javier Montaño, Héctor Novales-Sánchez, J. Jesús Toscano

摘要:

普遍的额外维度,可能在某些高能尺度上是可观测的,会改变低能的可观测量,这与标准模型在树的层次上禁止的物理过程特别相关。我们讨论了Kaluza-Klein从五维标准模型到反常磁矩和顶夸克电磁衰变的分支比的贡献。根据目前的界限上的紧化规模,这两个数量的贡献被发现是至少3个数量级低于标准模型的预测。

英文摘要:

Universal extra dimensions, presumably observable at some high-energy scale, would modify low-energy observables, being particularly relevant for physical processes forbidden at tree level by the Standard Model. We address the Kaluza-Klein contributions from the 5-dimensional Standard Model to the anomalous magnetic moment and to branching ratios of electromagnetic decays of the top quark. In accordance with present bounds on the compactification scale, contributions to both quantities are found to be at least 3 orders of magnitude below Standard-Model predictions.

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