6533b859fe1ef96bd12b6e7d
RESEARCH PRODUCT
On the nature of the fourth generation neutrino and its implications
Nuria RiusJuan Herrero-garciaAlberto ApariciArcadi Santamariasubject
PhysicsNuclear and High Energy PhysicsParticle physicsPhysics::Instrumentation and DetectorsAstrophysics::High Energy Astrophysical PhenomenaHigh Energy Physics::PhenomenologyFOS: Physical sciencesFísicaFermionLepton numberStandard ModelMAJORANAHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Fourth generationHigh Energy Physics::ExperimentNeutrinodescription
We consider the neutrino sector of a Standard Model with four generations. While the three light neutrinos can obtain their masses from a variety of mechanisms with or without new neutral fermions, fourth-generation neutrinos need at least one new relatively light right-handed neutrino. If lepton number is not conserved this neutrino must have a Majorana mass term whose size depends on the underlying mechanism for lepton number violation. Majorana masses for the fourth generation neutrinos induce relative large two-loop contributions to the light neutrino masses which could be even larger than the cosmological bounds. This sets strong limits on the mass parameters and mixings of the fourth generation neutrinos.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-04-04 |