Real singlet scalar dark matter extension of the Georgi-Machacek model

The Georgi-Machacek model extends the Standard Model Higgs sector with the addition of isospin-triplet scalar fields in such a way as to preserve the custodial symmetry. The presence of higher-isospin scalars contributing to electroweak symmetry breaking offers the interesting possibility that the c...

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Veröffentlicht in:Physical review. D 2017-01, Vol.95 (1), Article 016005
Hauptverfasser: Campbell, Robyn, Godfrey, Stephen, Logan, Heather E., Poulin, Alexandre
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creator Campbell, Robyn
Godfrey, Stephen
Logan, Heather E.
Poulin, Alexandre
description The Georgi-Machacek model extends the Standard Model Higgs sector with the addition of isospin-triplet scalar fields in such a way as to preserve the custodial symmetry. The presence of higher-isospin scalars contributing to electroweak symmetry breaking offers the interesting possibility that the couplings of the 125 GeV Higgs boson to both gluons and vector boson pairs could be larger than those of the Standard Model Higgs boson. Constraining this possibility using measurements of Higgs production and decay at the CERN Large Hadron Collider is notoriously problematic if a new, non–Standard Model decay mode of the 125 GeV Higgs boson is present. We study an implementation of this scenario in which the Georgi-Machacek model is extended by a real singlet scalar dark matter candidate, and require that the singlet scalar account for all the dark matter in the Universe. The combination of the observed dark matter relic density and direct-detection constraints exclude singlet scalar masses below about 57 GeV. Higgs measurements are not yet precise enough to be very sensitive to h→SS in the remaining allowed kinematic region, so that constraints from Higgs measurements are so far the same as in the GM model without a singlet scalar. We also find that, above the Higgs pole, a substantial region of parameter space yielding the correct dark matter relic density can escape the near-future direct-detection experiments DEAP and XENON 1T for dark matter masses as low as 120 GeV and even have a direct-detection cross section below the neutrino floor for mS≳150  GeV. This is in contrast to the singlet scalar dark matter extension of the Standard Model, for which these future experiments are expected to exclude dark matter masses above the Higgs pole up to the multi-TeV range.
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source American Physical Society Journals
subjects Broken symmetry
Couplings
Dark matter
Decay
Density
Gluons
Higgs bosons
Large Hadron Collider
Neutrinos
Quarks
Scalars
Universe
Xenon
title Real singlet scalar dark matter extension of the Georgi-Machacek model
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