The Singly-Charged Scalar Singlet as the Origin of Neutrino Masses

Abstract

We consider the generation of neutrino masses via a singly-charged scalar singlet. Under general assumptions we identify two distinct structures for the neutrino mass matrix. This yields a constraint for the antisymmetric Yukawa coupling of the singly-charged scalar singlet to two left-handed lepton doublets, irrespective of how the breaking of lepton-number conservation is achieved. The constraint disfavours large hierarchies among the Yukawa couplings. We study the implications for the phenomenology of lepton-flavour universality, measurements of the $W$-boson mass, flavour violation in the charged-lepton sector and decays of the singly-charged scalar singlet. We also discuss the parameter space that can address the Cabibbo Angle Anomaly.

38 pages, 12 figures, 2 tables, published in JHEP, references added, minor clarifications added

References in corpus (25)

• The anomalous magnetic moment of the muon in the Standard Model
• The fate of hints: updated global analysis of three-flavor neutrino oscillations
• Measurement of the fine-structure constant as a test of the Standard Model
• From the trees to the forest: a review of radiative neutrino mass models
• A Survey of Lepton Number Violation Via Effective Operators
• The low-scale approach to neutrino masses
• Prospects for the Zee-Babu Model at the LHC and low energy experiments
• Systematic classification of two-loop realizations of the Weinberg operator
• Global Electroweak Fit and Vector-Like Leptons in Light of the Cabibbo Angle Anomaly
• A Three-Loop Model of Neutrino Mass with Dark Matter
• Origin of neutrino masses at the LHC: Delta L = 2 effective operators and their ultraviolet completions
• On the Origin of Neutrino Masses
• Cabibbo anomaly versus electroweak precision tests: An exploration of extensions of the Standard Model
• Explaining $b\to s{\ell }^{+}{\ell }^{-}$ and the Cabibbo Angle Anomaly with a Vector Triplet
• Searching for Lepton Flavour (Universality) Violation and Collider Signals from a Singly-Charged Scalar Singlet
• A Class of Three-Loop Models with Neutrino Mass and Dark Matter
• Recipes and Ingredients for Neutrino Mass at Loop Level
• Neutrino Masses, Grand Unification, and Baryon Number Violation
• Testing Radiative Neutrino Mass Models at the LHC
• Master Majorana neutrino mass parametrization
• Muon $g-2$ and CKM Unitarity in Extra Lepton Models
• Physics with near detectors at a neutrino factory
• Exploding operators for Majorana neutrino masses and beyond
• Minimal Radiative Neutrino Masses
• Lepton number violating operators with standard model gauge fields: A survey of neutrino masses from 3-loops and their link to dark matter

Cited by in corpus (12)

• A Minimal Explanation of Flavour Anomalies: B-Meson Decays, Muon Magnetic Moment, and the Cabibbo Angle
• Addressing the CKM Unitarity Problem with a Vector-like Up Quark
• Unveiling Hidden Physics at the LHC
• Testing Lepton Flavor Universality with Pion, Kaon, Tau, and Beta Decays
• Effective comparison of neutrino-mass models
• Probing Heavy Neutrino Magnetic Moments at the LHC using Long-Lived Particle Searches
• Neutrino masses from new seesaw models: Low-scale variants and phenomenological implications
• MeV Sterile Neutrino in light of the Cabibbo-Angle Anomaly
• Generalised Casas-Ibarra Parametrisation for Majorana Neutrino Masses
• Running of neutrino mass parameters in the Zee model
• Aligned Zee-Grimus-Neufeld model for $(g-2{)}_{\mu }$
• SMEFT Analysis of $m_W$