Constraining models with a large scalar multiplet

Earl, Kevin; Hartling, Katy; Logan, Heather E.; Pilkington, Terry

doi:10.1103/physrevd.88.015002

Cited by 39 publications

(47 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This accidental symmetry cannot be spontaneously broken without generating a phenomenologically unacceptable extra Nambu-Goldstone boson. All such models preserving the U(1) are excluded by dark matter cosmological relic densities and direct-detection cross section via Z exchange [7]. In this paper we are not concerned with dark matter and will thus explicitly break the accidental symmetry with a nonrenormalizable operator as done in [4].…”

Section: Jhep05(2014)150mentioning

confidence: 99%

Surveying the scope of the SU(2) L scalar septet sector

Alvarado

Lehman

Ostdiek

2014

J. High Energ. Phys.

View full text Add to dashboard Cite

Extending the Standard Model by adding a scalar field transforming as a septet under SU(2) L preserves the ρ parameter at tree level and can satisfy experimental constraints on the electroweak parameters S and T . This work presents the first fully general phenomenological study of such an extension. We examine constraints on the septet model couplings based on electroweak and Higgs observables, and use LHC searches for new physics to bound the mass of the septet to be above ∼ 400 GeV at a 95% CL.

show abstract

Section: Jhep05(2014)150mentioning

confidence: 99%

Surveying the scope of the SU(2) L scalar septet sector

Alvarado

Lehman

Ostdiek

2014

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…The term proportional to λ 4 is not present in the models with Y = 2T considered in Ref. [19]. This term couples two SM Higgs fields Φ (not Φ * ) to two Z * fields, with each pair arranged in an isospin-triplet configuration with total hypercharge ±2.…”

Section: The Modelsmentioning

confidence: 99%

“…We studied these models in Ref. [19] and showed that all except the n = 5 model are excluded by dark matter direct detection experiments assuming a standard thermal history of the universe. The model with n = 5 avoids exclusion from this constraint because its lightest member can decay via a dimension-5 Planck-suppressed operator with a lifetime short compared to the age of the universe.…”

Section: Introductionmentioning

confidence: 99%

Two viable large scalar multiplet models with aZ2symmetry

et al. 2014

Self Cite

View full text Add to dashboard Cite

We study models in which the Higgs sector is extended by a single scalar electroweak multiplet Z with isospin T = 5/2 (sextet) or 7/2 (octet) and the same hypercharge as the Standard Model Higgs doublet, in which Z is odd under a global Z2 symmetry. This Z2 symmetry keeps the lightest (neutral) member of Z stable and has interesting implications for phenomenology. We determine the constraints on these models from precision electroweak measurements and Higgs boson decays to two photons. We compute the thermal relic density of the stable member of Z and show that, for masses below 1 TeV, it can make up at most 1% of the dark matter in the universe. We also show that current dark matter direct detection experiments do not constrain the models, but future ton-scale experiments will probe their parameter space.

show abstract

“…It seems that there could be an infinite number of models satisfying the above generic features. But when considering constraints from perturbative unitarity 2 [63,64], we will concentrate on SU(2) L scalar multiplet no larger than quintuplet in this paper. Meanwhile, the number of candidate models could be significantly reduced when we only consider the models with non-tuning VEVs for additional scalars S 1,2 [18].…”

Section: Jhep04(2017)166mentioning

confidence: 99%

Naturally small Dirac neutrino mass with intermediate SU(2) L multiplet fields

Wang

Han

2017

J. High Energ. Phys.

View full text Add to dashboard Cite

If neutrinos are Dirac fermions, certain new physics beyond the standard model should exist to account for the smallness of neutrino mass. With two additional scalars and a heavy intermediate fermion, in this paper, we systematically study the general mechanism that can naturally generate the tiny Dirac neutrino mass at tree and in one-loop level. For tree level models, we focus on natural ones, in which the additional scalars develop small vacuum expectation values without fine-tuning. For one-loop level models, we explore those having dark matter candidates under Z D 2 symmetry. In both cases, we concentrate on SU(2) L multiplet scalars no larger than quintuplet, and derive the complete sets of viable models. Phenomenologies, such as lepton flavor violation, leptogenesis, DM and LHC signatures are briefly discussed.

show abstract

Constraining models with a large scalar multiplet

Cited by 39 publications

References 50 publications

Surveying the scope of the SU(2) L scalar septet sector

Surveying the scope of the SU(2) L scalar septet sector

Two viable large scalar multiplet models with aZ2symmetry

Naturally small Dirac neutrino mass with intermediate SU(2) L multiplet fields

Contact Info

Product

Resources

About