Riding the Seesaw: What Higgsstrahlung May Reveal about Massive Neutrinos

Abstract

We investigate if the projected high-precision measurements of the cross section of the Higgsstrahlung process $e^{+}{e}^{-}\to Zh$ at a future electron-positron collider can be utilised to indirectly probe the fermionic Seesaw models. We consider the two centre-of-mass energies $\sqrt{s}=240$ GeV and $365$ GeV, and compare the collider reaches to constraints from electroweak observables, probes of lepton flavour universality and the existing and prospective bounds from searches for lepton flavour violation. For the analysis we assume the limit of an exactly conserved lepton-number symmetry. We find that while any appreciable correction to the Higgsstrahlung cross section is already strictly constrained in the Type-I Seesaw model, effects of up to $\mathcal{O}(10\%)$ are possible within Type-III Seesaw.

37 pages, 8 figures. v3: Updated to match published version - added references, considered more nuclei for LFV, improved discussion; conclusions unchanged. v2: Added references, corrected error in R(V_us), added Feynman diagrams, improved discussion; conclusions unchanged

References in corpus (25)

• 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
• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Low energy effects of neutrino masses
• Minimal Flavour Seesaw Models
• A possible symmetry of the $\nu$MSM
• The Present and Future Status of Heavy Neutral Leptons
• Beta decays as sensitive probes of lepton flavor universality
• The minimal 3+2 neutrino model versus oscillation anomalies
• Global analysis of electroweak data in the Standard Model
• Snowmass White Paper: Beyond the Standard Model effects on Neutrino Flavor
• Complete One-loop Matching of the Type-I Seesaw Model onto the Standard Model Effective Field Theory
• Bounds on the triplet fermions in type-III seesaw and implications for collider searches
• Testing Lepton Flavor Universality with Pion, Kaon, Tau, and Beta Decays
• The Search for ${\mu }^{+}\to e^{+}\gamma$ with 10${}^{-14}$ Sensitivity: the Upgrade of the MEG Experiment
• The see-saw portal at future Higgs Factories
• Complete theory of radiative corrections to $K_{\ell 3}$ decays and the $V_{us}$ update
• Collider Searches for Heavy Neutral Leptons: beyond simplified scenarios
• Neutrino seesaw models at one-loop matching: Discrimination by effective operators
• Effective comparison of neutrino-mass models
• Comprehensive Analysis of Charged Lepton Flavour Violation in the Symmetry Protected Type-I Seesaw
• Global Bounds on the Type-III Seesaw
• Two-Loop Electroweak Corrections with Fermion Loops to $e^{+}{e}^{-}\to ZH$
• Heavy Neutrino Searches via Same-sign Lepton Pairs at the Higgs Factory
• The Mu2e Experiment -- Searching for Charged Lepton Flavor Violation