Papers › The e^+ e^- →Z H Process in the SMEFT Beyond Leading Order
The e^+ e^- →Z H Process in the SMEFT Beyond Leading Order
Konstantin Asteriadis, Sally Dawson, Pier Paolo Giardino, Robert Szafron
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We systematically study potential effects of Beyond the Standard Model physics in the e^+ e^- →Z H process. To this end, we include all relevant dimension-6 Standard Model Effective Field Theory operators and work to next-to-leading order (NLO) accuracy in the electroweak coupling. We consider both polarized and unpolarized electron and positron beams and present results for √(s)=240, 365 and 500 GeV, emphasizing contributions where the NLO predictions differ significantly from the leading order results. At NLO, a sensitivity arises to operators that do not contribute at tree level, such as the Higgs tri-linear coupling, CP-violating operators, and dimension-6 operators involving the top quark, among many others. We compare the prospects of future e^+e^- colliders to explore these new physics effects with existing measurements from the LHC, electron EDMs (for CP violating operators), and Z pole measurements.
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