Real singlet scalar dark matter extension of the Georgi-Machacek model
arXiv:1610.08097 · doi:10.1103/PhysRevD.95.016005
Abstract
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 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 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.
17 pages, 8 figures
References in corpus (23)
- Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
- Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
- Gauge Singlet Scalars as Cold Dark Matter
- LHC Phenomenology of an Extended Standard Model with a Real Scalar Singlet
- SuperIso v3.0: A program for calculating flavor physics observables in 2HDM and supersymmetry
- SuperIso: A program for calculating the isospin asymmetry of B -> K* gamma in the MSSM
- The decoupling limit in the Georgi-Machacek model
- Search for anomalous production of prompt same-sign lepton pairs and pair-produced doubly charged Higgs bosons with TeV collisions using the ATLAS detector
- Singlet Scalar Dark Matter: monochromatic gamma rays and metastable vacua
- Unitarity bounds in the Higgs model including triplet fields with custodial symmetry
- Invisible Higgs Decay Width vs. Dark Matter Direct Detection Cross Section in Higgs Portal Dark Matter Models
- Extending two-Higgs-doublet models by a singlet scalar field - the Case for Dark Matter
- A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess
- Indirect constraints on the Georgi-Machacek model and implications for Higgs couplings
- Novel Constraint on Parameter Space of the Georgi-Machacek Model by Current LHC Data
- Higgs couplings in a model with triplets
- Revisiting Theories with Enhanced Higgs Couplings to Weak Gauge Bosons
- Electroweak Phase Transition in Georgi-Machacek Model
- LHC Run-I constraint on the mass of doubly charged Higgs bosons in the same-sign diboson decay scenario
- Dark matter annihilation through a lepton-specific Higgs boson
- Surveying the Scope of the SU(2)_L Scalar Septet Sector
- Supersymmetric Custodial Higgs Triplets and the Breaking of Universality
- Double Higgs production at LHC, see-saw type II and Georgi-Machacek model