Cornering variants of the Georgi-Machacek model using Higgs precision data

Research output: Contribution to journalArticle


We show that in the absence of trilinear terms in the scalar potential of the Georgi-Machacek model, heavy charged scalars do not necessarily decouple from the h→γγ decay amplitude. In such scenarios, measurement of the Higgs to diphoton signal strength can place stringent constraints in the parameter space. Using the projected precisions at the High Luminosity LHC (HL-LHC) and the ILC, we find that the upper bound on the triplet vacuum expectation value can be as low as 10 GeV. We also found that when combined with the theoretical constraints from perturbative unitarity and stability, such variants may be ruled out altogether.


External organisations
  • University of Calcutta
  • Istituto Nazionale di Fisica Nucleare
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number095010
JournalPhysical Review D
Issue number9
Publication statusPublished - 2018
Publication categoryResearch