NLO EW and QCD dimension-6 SMEFT results for Higgs and gauge boson decays in POPxf format

Abstract

We present next-to-leading-order (NLO) QCD and electroweak (EW) results using the dimension-6 SMEFT for all 2- and 4- body Higgs decays, for $Z$ and $W$ decays along with the corresponding EW precision observables, and for the Higgstrahlung process $e^{+}{e}^{-}\to ZH$ at $\sqrt{s}=240$, $365$ and $500$ GeV. The results are presented in the POPxf format for ease of use in experimental and phenomenological studies. Of particular utility is the total Higgs width, including all dimension-6 contributions at NLO. In addition, we present the differential distributions $d\Gamma /d{m}_{Z\ast }$ for $H\to l^{+}{l}^{-}{Z}^{\ast },Z^{\ast }\to l^{+}{l}^{-}$ at NLO in the SMEFT.

Comments: 14 pages, 19 figures; v2: Normalization of SMEFT coefficients changed to align with POPxf convention in WCxf basis