Phenomenology of the Georgi-Machacek model at future electron-positron colliders

Abstract

We study the phenomenology of the exotic Higgs bosons in the Georgi-Machacek model at future electron-positron colliders such as the International Linear Collider (ILC), assuming the collision energies of 500 GeV and 1 TeV. We show that the existence of the neutral and singly-charged Higgs bosons in the 5-plet representation under the custodial $SU(2{)}_V$ symmetry can be readily identified by studying various energy and invariant mass distributions of the $W^{+}{W}^{-}Z$ final state. Moreover, their masses can be determined with sufficiently high precision to test the mass degeneracy, a feature due to the custodial symmetry of the model. A synergy between such searches at the ILC and the doubly-charged Higgs search at the LHC will make the 5-plet Higgs boson study more comprehensive.

Version accepted in PRD

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• $WWV$ $(V=\gamma ,Z)$ vertex in the Georgi-Machacek model
• $H_5^{\pm \pm }{h}^0$ production via vector-boson fusion in Georgi-Machacek model at hadron colliders
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• Diphoton signals for the Georgi-Machacek scenario at the Large Hadron Collider
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