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Neutrino-lepton masses, Zee scalars, and muon g-2
Physical Review Letters
|September 5, 2001
Summary
Neutrino masses are explained by extending the Zee model with a right-handed singlet neutrino. This minimal extension also accounts for the muon anomalous magnetic moment anomaly, suggesting a light charged Zee scalar.
Area of Science:
- Particle Physics
- Theoretical Physics
- Cosmology
Background:
- Neutrino oscillations provide evidence for non-zero neutrino masses.
- The Zee model offers a mechanism for generating radiative neutrino masses, involving a singlet Zee scalar.
- Explaining neutrino mass patterns and anomalies requires extensions to the Standard Model of particle physics.
Purpose of the Study:
- To minimally extend the Zee model by incorporating a right-handed singlet neutrino (nu(R)).
- To explore a U(1)(X) symmetry for protecting the radiative Zee mechanism.
- To construct Froggatt-Nielsen (FN) models explaining neutrino and lepton mass patterns.
- To analyze the impact of the extended model on the muon anomalous magnetic moment (g(mu)-2) and mu-->egamma decay.
Main Methods:
- Minimal extension of the Zee model with a right-handed singlet neutrino.
- Introduction of a U(1)(X) symmetry to stabilize the radiative Zee mechanism.
- Construction of horizontal U(1)(FN) models for mass pattern explanation.
- Phenomenological analysis of the muon anomalous magnetic moment and rare muon decays.
Main Results:
- The minimal extension, including nu(R) interactions, successfully explains the Brookhaven National Laboratory (BNL) g(mu)-2 anomaly.
- A light charged Zee scalar with a mass between 100-300 GeV is predicted.
- The proposed U(1)(FN) models naturally explain the observed mass hierarchies of neutrinos and charged leptons.
Conclusions:
- The minimal extension of the Zee model provides a consistent framework for neutrino masses and magnetic moment anomalies.
- The existence of a light charged Zee scalar is a key prediction of this model.
- This work offers a viable theoretical explanation for fundamental parameters in neutrino physics and flavor physics.
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