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RESEARCH PRODUCT
Majorana vs pseudo-Dirac neutrinos at the ILC
Pilar HernándezJoel Jones-perezO. Suarez-navarrosubject
Particle physicsPhysics and Astronomy (miscellaneous)media_common.quotation_subjectFOS: Physical scienceslcsh:Astrophysics01 natural sciences7. Clean energyAsymmetryHigh Energy Physics - Phenomenology (hep-ph)Seesaw molecular geometryDouble beta decay0103 physical scienceslcsh:QB460-466lcsh:Nuclear and particle physics. Atomic energy. Radioactivity010306 general physicsEngineering (miscellaneous)media_commonPhysics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyFermionLepton numberMAJORANAHigh Energy Physics - Phenomenologylcsh:QC770-798High Energy Physics::ExperimentNeutrinoLeptondescription
Neutrino masses could originate in seesaw models testable at colliders, with light mediators and an approximate lepton number symmetry. The minimal model of this type contains two quasi-degenerate Majorana fermions forming a pseudo-Dirac pair. An important question is to what extent future colliders will have sensitivity to the splitting between the Majorana components, since this quantity signals the breaking of lepton number and is connected to the light neutrino masses. We consider the production of these neutral heavy leptons at the ILC, where their displaced decays provide a golden signal: a forward–backward charge asymmetry, which depends crucially on the mass splitting between the two Majorana components. We show that this observable can constrain the mass splitting to values much lower than current bounds from neutrinoless double beta decay and natural loop corrections.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-03-01 |