Impact of NLO Weak SMEFT Corrections in $e^{+}{e}^{-}\to ZH$

Abstract

We present results from a complete next-to-leading order (NLO) calculation of $e^{+}{e}^{-}\to ZH$ in the Standard Model Effective Field Theory (SMEFT) framework, including all contributions from dimension-6 operators. At NLO, there are novel dependencies on CP violating parameters in the gauge sector, on modifications to the Higgs boson self-couplings, on alterations to the top quark Yukawa couplings, and on 4-fermion operators involving the electron and the top quark, among others. We show that including only the logarithms resulting from renormalization group scaling can produce misleading results, and further, we explicitly demonstrate the constraining power of combining measurements from different energy scales.

6 pages, 5 figures v2: Accepted version

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