Clues on the Majorana scale from scalar resonances at the LHC

Abstract

In order to address the observation of the neutrino oscillations and the metastability of the Standard Model, we extend the fermion sector with two right-handed (i.e. sterile) neutrinos, and the scalar sector of the SM with a real scalar, the Hill field. The latter takes the role of a Majoron and generates the Majorana masses for the neutrino sector, such that the particle spectrum features two CP-even scalars $h_1$ and $h_2$, and also two heavy, mass degenerate neutrinos. When the $h_1$ is identified with the scalar resonance at ~125 GeV and the condition is imposed that the $h_1$ self coupling and its running vanish at the Planck scale, the scalar mixing and the vacuum expectation value of the Hill field are fixed by the $h_2$ mass. The $h_2$ can be searched for at the LHC, and it has prospects of being discovered for the target integrated luminosities of the HL-LHC and the Future Circular hadron Collider (FCC-hh) when its mass is on the weak scale. The knowledge of the $h_2$ mass and its decay properties can yield an insight into its coupling to the heavy neutrinos, and thus also on the heavy neutrino mass scale. This yields an interesting connection between potentially detectable heavy scalars in high-energy proton collisions and the mass scale of the heavy neutrinos that is testable at the LHC and at future colliders.

arXiv commentVersion accepted for publication by MPLA

References in corpus (33)

• Combined Measurement of the Higgs Boson Mass in $pp$ Collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS and CMS Experiments
• Higgs mass and vacuum stability in the Standard Model at NNLO
• WHIZARD: Simulating Multi-Particle Processes at LHC and ILC
• HiggsBounds: Confronting Arbitrary Higgs Sectors with Exclusion Bounds from LEP and the Tevatron
• A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector
• Higgs boson mass and new physics
• Neutrinos and Collider Physics
• Measurement of the properties of a Higgs boson in the four-lepton final state
• Measurements of Higgs boson production and couplings in diboson final states with the ATLAS detector at the LHC
• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• First Look at the Physics Case of TLEP
• Novel Supersymmetric SO(10) Seesaw Mechanism
• Radiatively Induced Neutrino Masses and Large Higgs-Neutrino Couplings in the Standard Model with Majorana Fields
• Status of the Higgs Singlet Extension of the Standard Model after LHC Run 1
• Applying Exclusion Likelihoods from LHC Searches to Extended Higgs Sectors
• Minimal Flavour Seesaw Models
• Non-unitarity of the leptonic mixing matrix: Present bounds and future sensitivities
• A possible symmetry of the $\nu$MSM
• Stability, Higgs Boson Mass and New Physics
• Vacuum Stability, Perturbativity, and Scalar Singlet Dark Matter
• Heavy neutrino signals at large hadron colliders
• Testing sterile neutrino extensions of the Standard Model at future lepton colliders
• A different see-saw formula for neutrino masses
• Delta r and the W-boson mass in the Singlet Extension of the Standard Model
• LHC Benchmark Scenarios for the Real Higgs Singlet Extension of the Standard Model
• Phenomenological signatures of additional scalar bosons at the LHC
• A study of electroweak vacuum metastability with a singlet scalar dark matter
• Constraints on inert dark matter from metastability of the electroweak vacuum
• Electroweak Vacuum Stability and Diphoton Excess at 750 GeV
• Collider Constraints and Prospects of a Scalar Singlet Extension to Higgs Portal Dark Matter
• Vacuum stability with spontaneous violation of lepton number
• A renormalization group analysis of the Hill model and its HEIDI extension
• A singlet-triplet extension for the Higgs search at LEP and LHC

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• Naturally Small Dirac Neutrino Mass with Intermediate $SU(2{)}_L$ Multiplet Fields
• Study of Electroweak Vacuum Stability from Extended Higgs Portal of Dark Matter and Neutrinos
• CP in the dark