酉规范中的企鹅图和盒图
Penguin and Box Diagrams in Unitary Gauge
摘要：
我们评估的幺正规范，有助于口味变化的中性电流（FCNC）过渡涉及两个和四个费米子的单回路图。具体来说，我们处理企鹅和盒图内产生的标准模型（SM）和nonrenormalizable扩展与异常耦合的W玻色子夸克。我们明确地表明，在SM的微妙的抵消之间的分歧，从个别的统一规范的贡献，一些物理FCNC振幅和导出的表达式与文献中获得的使用R_xi规范。我们的一些结果可以更普遍地用于某些模型，涉及费米子和规范玻色子的相互作用类似的形式，我们考虑。
英文摘要：
We evaluate one-loop diagrams in the unitary gauge that contribute to flavor-changing neutral current (FCNC) transitions involving two and four fermions. Specifically, we deal with penguin and box diagrams arising within the standard model (SM) and in nonrenormalizable extensions thereof with anomalous couplings of the W boson to quarks. We show explicitly in the SM the subtle cancelation among divergences from individual unitary-gauge contributions to some of the physical FCNC amplitudes and derive expressions consistent with those obtained using R_xi gauges in the literature. Some of our results can be used more generally in certain models involving fermions and gauge bosons which have interactions similar in form to those we consider.
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