Bilinear R-parity violation and small neutrino masses : a self-consistent framework

ABSTRACT: We study extensions of supersymmetric models without R-parity which include an anomalous U.1/H horizontal symmetry. Bilinear R-parity violating terms induce a neutrino mass at tree level mvtree ~~ (tetha2)& eV where tetha ~_ 0.22 is the U(1)H breaking parameter and & is an integer number that depends on the horizontal charges of the leptons. For &=1 a unique self-consistent model arises in which (i) all the superpotential trilinear R-parity violating couplings are forbidden by holomorphy; (ii) mvtree falls in the range suggested by the atmospheric neutrino problem; (iii) radiative contributions to neutrino masses are strongly suppressed resulting in m2 solar ~~ fe 10^8 eV2 which only allows for the LOW (or quasi-vacuum) solution to the solar neutrino problem; (iv) the neutrino mixing angles are not suppressed by powers of tetha and can naturally be large.

• Autores: Mira Martínez, Jesús María; Nardi, Enrico; Restrepo Quintero, Diego Alejandro; Valle, José W. F.
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2000
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/8393
• Acceso en línea: http://hdl.handle.net/10495/8393
• Palabra clave: Neutrinos; R bilineal
• Rights: openAccess
• License: Atribución-CompartirIgual 2.5 Colombia (CC BY-SA 2.5 CO)