Journal article
On the impact of dimension-eight SMEFT operators on Higgs measurements
- Abstract:
- Using the production of a Higgs boson in association with a W boson as a test case, we assess the impact of dimension-8 operators within the context of the Standard Model Effective Field Theory. Dimension-8-SM-interference and dimension-6-squared terms appear at the same order in an expansion in 1/Λ, hence dimension-8 effects can be treated as a systematic uncertainty on the new physics inferred from analyses using dimension-6 operators alone. To study the phenomenological consequences of dimension-8 operators, one must first determine the complete set of operators that can contribute to a given process. We accomplish this through a combination of Hilbert series methods, which yield the number of invariants and their field content, and a step-by-step recipe to convert the Hilbert series output into a phenomenologically useful format. The recipe we provide is general and applies to any other process within the dimension ≤ 8 Standard Model Effective Theory. We quantify the effects of dimension-8 by turning on one dimension-6 operator at a time and setting all dimension-8 operator coefficients to the same magnitude. Under this procedure and given the current accuracy on σ(pp → h W + ), we find the effect of dimension-8 operators on the inferred new physics scale to be small, O(few %), with some variation depending on the relative signs of the dimension-8 coefficients and on which dimension-6 operator is considered. The impact of the dimension-8 terms grows as σ(pp → hW + ) is measured more accurately or (more significantly) in high-mass kinematic regions. We provide a FeynRules implementation of our operator set to be used for further more detailed analyses.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
Actions
Access Document
- Files:
-
-
(Preview, Version of record, pdf, 962.7KB, Terms of use)
-
- Publisher copy:
- 10.1007/JHEP02(2019)123
Authors
- Publisher:
- Springer Verlag
- Journal:
- Journal of High Energy Physics More from this journal
- Volume:
- 2019
- Issue:
- 123
- Publication date:
- 2019-02-19
- Acceptance date:
- 2019-02-02
- DOI:
- EISSN:
-
1029-8479
- Keywords:
- Pubs id:
-
pubs:981031
- UUID:
-
uuid:6467acfa-505b-400d-9582-6f4688afef4e
- Local pid:
-
pubs:981031
- Source identifiers:
-
981031
- Deposit date:
-
2019-09-10
Terms of use
- Copyright holder:
- Hays et al
- Copyright date:
- 2019
- Notes:
- © The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
- Licence:
- CC Attribution (CC BY)
If you are the owner of this record, you can report an update to it here: Report update to this record