Electroweak input schemes and universal corrections in SMEFT

Biekötter, Anke; Pecjak, Benjamin D.; Scott, Darren J.; Smith, Tommy

Abstract

The choice of an electroweak (EW) input scheme is an important component of perturbative calculations in Standard Model Effective Field Theory (SMEFT). In this paper we perform a systematic study of three different EW input schemes in SMEFT, in particular those using the parameter sets {MW, MZ, GF}, {MW, MZ, α}, or {α, MZ, GF}. We discuss general features and calculate decay rates of Z and W bosons to leptons and Higgs decays to bottom quarks in these three schemes up to next-to-leading order (NLO) in dimension-six SMEFT. We explore the sensitivity to Wilson coefficients and perturbative convergence in the different schemes, and show that while the latter point is more involved than in the Standard Model, the dominant scheme-dependent NLO corrections are universal and can be taken into account by a simple set of substitutions on the leading-order results. Residual NLO corrections are then of similar size between the different input schemes, and performing calculations in multiple schemes can give a useful handle on theory uncertainties in SMEFT predictions and fits to data.

Citation

Biekötter, A., Pecjak, B. D., Scott, D. J., & Smith, T. (2023). Electroweak input schemes and universal corrections in SMEFT. Journal of High Energy Physics, 2023(7), Article 115. https://doi.org/10.1007/jhep07%282023%29115

• Journal Article Type: Article
• Acceptance Date: Jun 10, 2023
• Online Publication Date: Jul 13, 2023
• Publication Date: 2023
• Deposit Date: Oct 9, 2023
• Publicly Available Date: Oct 9, 2023
• 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: 2023
• Issue: 7
• Article Number: 115
• DOI: https://doi.org/10.1007/jhep07%282023%29115
• Keywords: Electroweak Precision Physics, SMEFT
• Public URL: https://durham-repository.worktribe.com/output/1787927