Surveying the Scope of the SU(2)_L Scalar Septet Sector

Abstract

Extending the Standard Model by adding a scalar field transforming as a septet under $SU(2{)}_L$ preserves the $\rho$ 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 $\sim 400$ GeV at a $95\%$ CL.

arXiv commentpdfLateX, 17 pages, 6 figures, reference added. Version published in JHEP

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• All the generalized Georgi-Machacek models
• Real singlet scalar dark matter extension of the Georgi-Machacek model
• An $SU(2{)}_L$ Septet Scalar Linking to Radiative Neutrino Model
• Non-thermal Production of Minimal Dark Matter via Right-handed Neutrino Decay
• Supersymmetric Custodial Higgs Triplets and the Breaking of Universality
• Neutrino mass with large $SU(2{)}_L$ multiplet fields
• Light (and darkness) from a light hidden Higgs
• Dark Matter from the Supersymmetric Custodial Triplet Model
• Constraints on the septet-doublet mixing models from oblique parameters
• Scotogenic neutrino mass with large $SU(2{)}_L$ multiplet fields
• Constraining the scalar septet model through vector boson scattering
• Weak dipole moments of the tau lepton in models with an extended scalar sector
• Does unitarity imply finiteness of electroweak oblique corrections at one-loop? - constraining extra neutral Higgs bosons -
• LHC constraints on large scalar multiplet models with a $Z_2$ symmetry
• Oblique corrections when $m_W\ne m_Z\cos {\theta }_W$ at tree level