6533b82dfe1ef96bd1291e0a
RESEARCH PRODUCT
Global fits in the Georgi-Machacek model
Cheng-wei ChiangCheng-wei ChiangOtto EberhardtGiovanna Cottinsubject
PhysicsParticle physicsLarge Hadron Collider010308 nuclear & particles physicsBranching fractionPhysics beyond the Standard ModelScalar (mathematics)High Energy Physics::PhenomenologyFOS: Physical sciences01 natural sciencesVector bosonHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Signal strength0103 physical sciencesHiggs bosonHigh Energy Physics::ExperimentNeutrino010306 general physicsdescription
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. For these hypothetical particles, we identify the dominant decay channels and extract bounds on their branching ratios from the global fit, which can be used to single out the decay patterns relevant for the experimental searches.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-02 |