W-mass Anomaly in the Simplest Linear Seesaw Mechanism

Abstract

The simplest linear seesaw mechanism can accommodate the new CDF-II $W$ mass measurement. In addition to Standard Model particles, the model includes quasi-Dirac leptons, and a second, leptophilic, scalar doublet seeding small neutrino masses. Our proposal is consistent with electroweak precision tests, neutrino physics, rare decays and collider restrictions, requiring a new charged scalar below a few TeV, split in mass from the new degenerate scalar and pseudoscalar neutral Higgs bosons.

25 pages, 9 figures, 1 table

References in corpus (11)

• 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
• The oblique parameters in multi-Higgs-doublet models
• A precision constraint on multi-Higgs-doublet models
• The low-scale approach to neutrino masses
• Indirect searches for sterile neutrinos at a high-luminosity Z-factory
• Flavour in heavy neutrino searches at the LHC
• Master Majorana neutrino mass parametrization
• First direct neutrino-mass measurement with sub-eV sensitivity
• W boson mass in Singlet-Triplet Scotogenic dark matter model
• Understanding PDF uncertainty on the $W$ boson mass measurements in CT18 global analysis