Majorana vs pseudo-Dirac neutrinos at the ILC
| Autor: | Pilar Hernández, Joel Jones-Perez, O. Suarez-Navarro |
|---|---|
| Přispěvatelé: | European Commission, Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Pontificia Universidad Católica del Perú, Universidad de Valencia |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Particle physics
Physics and Astronomy (miscellaneous) media_common.quotation_subject FOS: Physical sciences lcsh:Astrophysics 01 natural sciences 7. Clean energy Asymmetry High Energy Physics - Phenomenology (hep-ph) Seesaw molecular geometry Double beta decay 0103 physical sciences lcsh:QB460-466 lcsh:Nuclear and particle physics. Atomic energy. Radioactivity 010306 general physics Engineering (miscellaneous) media_common Physics 010308 nuclear & particles physics High Energy Physics::Phenomenology Fermion Lepton number MAJORANA High Energy Physics - Phenomenology lcsh:QC770-798 High Energy Physics::Experiment Neutrino Lepton |
| Zdroj: | European Physical Journal C: Particles and Fields, Vol 79, Iss 3, Pp 1-11 (2019) Digital.CSIC. Repositorio Institucional del CSIC instname European Physical Journal |
| Popis: | 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. P.H. acknowledges support from Grants FPA2017-85985-P, and the European projects H2020-MSCA-ITN-2015//674896-ELUSIVES and H2020-MSCA-RISE-2015. J.J.P. acknowledges funding by the Dirección de Gestión de la Investigación at PUCP, through grant DGI-2015-3-0026. O.S.N. received funding from CienciActiva-CONCYTEC Grant 233-2015-1, as well as the grant Becas Jóvenes Investigadores 2017 from the Programa de Cooperación 07 de la Universitat de València. |
| Databáze: | OpenAIRE |
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