The $\hat{H}$-Parameter: An Oblique Higgs View

by Admir Greljo

Friday 3 May 2019, 14:00 → 16:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

I will discuss some theoretical and phenomenological aspects of the off-shell Higgs physics based on 1903.07725. The question “How does the Higgs boson propagate?” is framed in the context of Universal effective field theories. The Higgs boson oblique parameter $\hat{H}$ is introduced; consistency conditions stemming from Kallen-Lehmann representation are derived; examples of UV completions are provided. Finally, the four-top production is advertised as an effective high-energy probe of off-shell Higgs behaviour.