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.
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Acknowledgments
AB is supported by the Cluster of Excellence “Precision Physics, Fundamental Interactions, and Structure of Matter” (PRISMA+ EXC 2118/1) funded by the German Research Foundation (DFG) within the German Excellence Strategy (Project ID 390831469). BP would like to thank Marek Schönherr for informative discussions on SM implementations of the input schemes studied here.
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Biekötter, A., Pecjak, B.D. & Smith, T. Using the effective weak mixing angle as an input parameter in SMEFT. J. High Energ. Phys. 2024, 73 (2024). https://doi.org/10.1007/JHEP04(2024)073
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DOI: https://doi.org/10.1007/JHEP04(2024)073