Characterizing a benchmark scenario for heavy Higgs boson searches in the Georgi-Machacek model

Abstract

The Georgi-Machacek model is used to motivate and interpret LHC searches for doubly- and singly-charged Higgs bosons decaying into vector boson pairs. In this paper we study the constraints on and phenomenology of the "H5plane" benchmark scenario in the Georgi-Machacek model, which has been proposed for use in these searches. We show that the entire H5plane benchmark is compatible with the LHC measurements of the 125 GeV Higgs boson couplings. We also point out that, over much of the H5plane benchmark, the lineshapes of the two CP-even neutral heavy Higgs bosons $H$ and $H_5^0$ will overlap and interfere when produced in vector boson fusion with decays to $W^{+}{W}^{-}$ or $ZZ$. Finally we compute the decay branching ratios of the additional heavy Higgs bosons within the H5plane benchmark to facilitate the development of search strategies for these additional particles.

18 pages, 18 figures. v2: title changed, refs added, discussion clarified, version accepted by PRD

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Cited by in corpus (11)

• Electroweak phase transition and Higgs phenomenology in the Georgi-Machacek model
• Updated constraints on Georgi-Machacek model, and its electroweak phase transition and associated gravitational waves
• Unavoidable Higgs coupling deviations in the $Z_2$-symmetric Georgi-Machacek model
• Measurement and interpretation of same-sign $W$ boson pair production in association with two jets in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for resonant $WZ\to \ell \nu {\ell }^{\prime }{\ell }^{\prime }$ production in proton$-$proton collisions at $\sqrt{\mathbf{s}}=13$ TeV with the ATLAS detector
• Updated constraints on the Georgi-Machacek model from LHC Run 2
• Search for a lighter neutral custodial fiveplet scalar in the Georgi-Machacek model
• Charged Higgs decay to $W^{\pm }$ and heavy neutral Higgs decaying into ${\tau }^{+}{\tau }^{-}$ in Georgi Machacek Model at LHC
• LHC Signatures of the Generic Georgi-Machacek Model
• Doubly charged Higgs boson at same-sign lepton colliders
• Tagging ultra-boosted jets at FCC-hh using machine learning techniques