Loops and trees in generic EFTs

doi:10.1007/JHEP08(2020)086

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	Loops and trees in generic EFTs
	Craig, Nathaniel ; Jiang, Minyuan 1; Li, Ying-Ying ; Sutherland, Dave 5
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2020
期号	8 页码:86
关键词	HELICITY AMPLITUDES FEYNMAN DIAGRAMS STANDARD MODEL UNITARITY
ISSN号	1029-8479
DOI	10.1007/JHEP08(2020)086
英文摘要	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 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.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27383]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Univ Calif Santa Barbara, Dept Phys, Lagoon Rd, Santa Barbara, CA 93106 USA 2.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Zhong Guan Cun East St 55, Beijing, Peoples R China 3.Fermilab Natl Accelerator Lab, Theoret Phys Dept, Discovery Rd, Batavia, IL USA 4.Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Clear Water Bay Rd, Hong Kong, Peoples R China 5.Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Lagoon Rd, Santa Barbara, CA 93106 USA 6.INFN, Sez Trieste, Via Bonomea 265, I-34136 Trieste, Italy
推荐引用方式 GB/T 7714	Craig, Nathaniel,Jiang, Minyuan,Li, Ying-Ying,et al. Loops and trees in generic EFTs[J]. JOURNAL OF HIGH ENERGY PHYSICS,2020(8):86.
APA	Craig, Nathaniel,Jiang, Minyuan,Li, Ying-Ying,&Sutherland, Dave.(2020).Loops and trees in generic EFTs.JOURNAL OF HIGH ENERGY PHYSICS(8),86.
MLA	Craig, Nathaniel,et al."Loops and trees in generic EFTs".JOURNAL OF HIGH ENERGY PHYSICS .8(2020):86.