论文标题
通用eft中的循环和树木
Loops and trees in generic EFTs
论文作者
论文摘要
We consider aspects of tree and one-loop behavior in a generic 4d EFT of massless scalars, fermions, and vectors, with a particular eye to the high-energy limit of the Standard Model EFT at operator dimensions 6 and 8. First, we classify the possible Lorentz structures of operators and the subset of these that can arise at tree-level in a weakly coupled UV completion, extending the tree/loop classification through维度8使用功能方法。其次，我们研究了操作员如何对树和一环的螺旋幅度贡献，从而探索了通过维度8的非赋形定理的影响。我们进一步观察到，许多维度6对Helicity幅度的贡献，包括理性零件，包括合理零件，在一环水平上准确消失了。这表明，在非苏匹配EFT中，螺旋性选择规则的影响超出了一个循环。
We consider aspects of tree and one-loop behavior in a generic 4d EFT of massless scalars, fermions, and vectors, with a particular eye to the high-energy limit of the Standard Model EFT at operator dimensions 6 and 8. First, we classify the possible Lorentz structures of operators and the subset of these that can arise at tree-level in a weakly coupled UV completion, extending the tree/loop classification through dimension 8 using functional methods. Second, we investigate how operators contribute to tree and one-loop helicity amplitudes, exploring the impact of non-renormalization theorems through dimension 8. We further observe that many dimension 6 contributions to helicity amplitudes, including rational parts, vanish exactly at one-loop level. This suggests the impact of helicity selection rules extends beyond one loop in non-supersymmetric EFTs.
