Updated constraints on the Georgi-Machacek model from LHC Run 2

Abstract

We study the experimental constraints on the Georgi-Machacek model from direct searches for the new Higgs bosons and measurements of the properties of the discovered 125 GeV Higgs boson. We apply these by interfacing the public codes HiggsBounds 5.2.0 and HiggsSignals 2.2.1, which implement a large collection of direct-search constraints on extra Higgs bosons and measurements of the properties of the 125 GeV state to the model calculator GMCALC. We also implement constraints involving searches for doubly-charged Higgs bosons and Drell-Yan production of a neutral Higgs with decays to photon pairs directly into GMCALC; these channels are not included in HiggsBounds but provide important constraints on the model, especially at low mass. We identify new constraints on the model from $H_3^0\to Zh$ and $H\to hh$ and point out that these channels remain promising. We also determine the allowed range of couplings of the SM-like Higgs boson after all experimental constraints are applied and show that the direct searches for additional Higgs bosons are generally more constraining than the measurements of the 125 GeV Higgs boson couplings. The updated GMCALC code will be released as version 1.5.0.

arXiv comment16 pages, 15 figures; references added, submitted to PRD

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Cited by in corpus (7)

• Custodial symmetry violation in the Georgi-Machacek model
• A benchmark for LHC searches for low-mass custodial fiveplet scalars in the Georgi-Machacek model
• Search for a lighter neutral custodial fiveplet scalar in the Georgi-Machacek model
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• Charged Higgs decay to $W^{\pm }$ and heavy neutral Higgs decaying into ${\tau }^{+}{\tau }^{-}$ in Georgi Machacek Model at LHC
• Higgs triplet extension of GRACE