Complete Next-to-Leading-Order Standard-Model-Effective-Field-Theory Electroweak Corrections to Higgs Decays

Precise predictions for Higgs decays are a crucial ingredient of the search for beyond the standard model physics and the standard model effective field theory (SMEFT) is a valuable tool for quantifying deviations from the standard model. We present the complete set of predictions for the two- and three-body Higgs decays at next-to-leading order, considering QCD and electroweak corrections and including all contributions from the dimension-6 SMEFT operators and with an arbitrary flavor structure. Including the next-to-leading-order SMEFT results for Higgs decays greatly increases the sensitivity to beyond the standard model physics of the e^{+}e^{-}→Zh process at FCC-ee, as compared with that obtained using only the total cross section.