Using the effective weak mixing angle as an input parameter in SMEFT

Biekötter, Anke; Pecjak, Benjamin D.; Smith, Tommy

Abstract

We implement electroweak renormalisation schemes involving the effective weak mixing angle to NLO in Standard Model Effective Field Theory (SMEFT). After developing the necessary theoretical machinery, we analyse a select set of electroweak precision observables in such input schemes. An attractive feature is that large corrections from top-quark loops appearing in other schemes are absorbed into the definition of the effective weak mixing angle. On the other hand, the renormalisation condition which achieves this involves a large number of flavour-specific SMEFT couplings between the Z boson and charged leptons, motivating simple flavour assumptions such as minimal flavour violation for practical applications. The results of this paper provide a valuable new component for estimating systematic uncertainties in SMEFT fits by performing analyses in multiple input schemes.

Citation

Biekötter, A., Pecjak, B. D., & Smith, T. (2024). Using the effective weak mixing angle as an input parameter in SMEFT. Journal of High Energy Physics, 2024(4), Article 73. https://doi.org/10.1007/jhep04%282024%29073

• Journal Article Type: Article
• Acceptance Date: Mar 13, 2024
• Online Publication Date: Apr 12, 2024
• Publication Date: Apr 12, 2024
• Deposit Date: Apr 26, 2024
• Publicly Available Date: Apr 26, 2024
• Journal: Journal of High Energy Physics
• Print ISSN: 1126-6708
• Electronic ISSN: 1029-8479
• Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
• Peer Reviewed: Peer Reviewed
• Volume: 2024
• Issue: 4
• Article Number: 73
• DOI: https://doi.org/10.1007/jhep04%282024%29073
• Keywords: SMEFT, Higher Order Electroweak Calculations, Electroweak Precision Physics
• Public URL: https://durham-repository.worktribe.com/output/2389919