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2018

Global fits in the Georgi-Machacek model

Chiang, Cheng-Wei, Cottin, Giovanna, Eberhardt, Otto

Understand

Off the beaten track of scalar singlet and doublet extensions of the Standard Model, triplets combine an interesting LHC phenomenology with an explanation for neutrino masses.

The Georgi-Machacek model falls into this category, but it has never been fully explored in a global fit.
We use the {\texttt{HEPfit}} package to combine recent experimental Higgs data with theoretical constraints and obtain strong limits on the mixing angles and mass differences between the heavy new scalars as well as their decay widths.
We also find that the current signal strength measurements allow for a Higgs to vector boson coupling with an opposite sign to the Standard Model, but this possibility can be ruled out by the lack of direct evidence for heavy Higgs states.