Higgs Yukawa coupling constraints on a benchmark one-loop radiative mass model for the bottom, charm and tau

Abstract

Measurements of Higgs boson Yukawa couplings to Standard Model (SM) fermions constrain radiative mass models for those species. Such models, motivated by the observed fermion mass hierarchy, act as foils for the SM tree-level mechanism: we cannot claim to have verified the standard mechanism if other possibilities also fit the data well. We construct a benchmark model which generates the top mass at tree level, and the bottom, charm, tau, and tau Dirac neutrino masses at one-loop level. Current theoretical and experimental constraints on the model, including from Higgs decays, demonstrate it possesses viable regions of parameter space. We show that future improvements to measurements will not be able to rule out the model, only increase the scale of new physics required, illustrating how difficult it will be to verify the SM fermion mass generation mechanism with great precision. As a bonus, a dark matter candidate is shown to be capable of reproducing the correct relic density within the permitted parameter space.

7 pages, 4 figures. Matches published version with updated plots

References in corpus (23)

• A portrait of the Higgs boson by the CMS experiment ten years after the discovery
• Higgs Boson Studies at Future Particle Colliders
• Search for new phenomena in events with an energetic jet and missing transverse momentum in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Electroweak precision observables and Higgs-boson signal strengths in the Standard Model and beyond: present and future
• Cross-section measurements of the Higgs boson decaying into a pair of tau-leptons in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• An Effective Theory of Dirac Dark Matter
• Searches for physics beyond the standard model with the $M_{T2}$ variable in hadronic final states with and without disappearing tracks in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Phenomenological consequences of radiative flavor violation in the MSSM
• Radiative Origin of All Quark and Lepton Masses through Dark Matter with Flavor Symmetry
• Quark and lepton masses from top loops
• Models of Lepton and Quark Masses
• Anomalous Higgs Yukawa Couplings
• Fermion mass hierarchy in an extended left-right symmetric model
• Vector-like quarks: status and new directions at the LHC
• Radiatively generated fermion mass hierarchy from flavour non-universal gauge symmetries
• Has the Origin of the Third-Family Fermion Masses been Determined?
• Measurements of $WH$ and $ZH$ production with Higgs boson decays into bottom quarks and direct constraints on the charm Yukawa coupling in $13\mathrm{TeV}$ $pp$ collisions with the ATLAS detector
• Search for electroweak production of supersymmetric particles in final states with two $\tau$-leptons in $\sqrt{s}$ = 13 TeV $pp$ collisions with the ATLAS detector
• Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV $pp$ collisions with the ATLAS detector
• Naturalness made easy: two-loop naturalness bounds on minimal SM extensions
• Sequentially loop supressed fermion masses from a unique discrete symmetry
• Radiative Origin of Fermion Mass Hierarchy in Left-Right Symmetric Theory
• Simultaneous probe of the charm and bottom quark Yukawa couplings using $\mathrm{t}\bar{\mathrm{t}}$H events