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

Dipankar Das1,2,* and Ipsita Saha3,†

  • 1Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata 700009, India
  • 2Department of Astronomy and Theoretical Physics, Lund University, 221 00 Lund, Sweden
  • 3Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Piazzale Aldo Moro, 2, 00185, Roma, Italy

  • *dipankar.das@thep.lu.se
  • †ipsita.saha@roma1.infn.it
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Phys. Rev. D 98, 095010 – Published 12 November, 2018

DOI: https://doi.org/10.1103/PhysRevD.98.095010

Abstract

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.

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Phys. Rev. D 98, 095010– Published 12 November, 2018
  • Received 7 July 2018
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