Year: 2020
Type: article
Abstract: A bstract 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.
Source: Journal of High Energy Physics
Authors: Nathaniel Craig, Minyuan Jiang, Ying-Ying Li, Dave Sutherland
Institutions: University of California, Santa Barbara, Chinese Academy of Sciences, Institute of Theoretical Physics, Fermi National Accelerator Laboratory, Hong Kong University of Science and Technology, Kavli Institute for Theoretical Physics, Scuola Internazionale Superiore di Studi Avanzati, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G132386199, G1871477277, G2310239675, G3663515235, G4185431342, G434337789, G4404904460, G4606701553, LEVERAGING THE HIGGS TO DISCOVER PHYSICS BEYOND THE STANDARD MODEL, G498139845, G5261598906, G5603896232, G5616713406, G585908603, G6598239468, FELLowship for Innovation at INFN, G716412294, Kavli Institute for Theoretical Physics, G86560745, G969889393, G985207216
OpenAlex ID: W2997218762