Lepton number violation in theories with a large number of standard model copies
- Departamento de Fisica, Universidad Tecnica Federico Santa Maria and Centro Cientifico-Tecnologico de Valparaiso, Casilla 110-V, Valparaiso, Valparaiso (Chile)
- Fakultaet fuer Physik, Technische Universitaet Dortmund, D-44221, Dortmund (Germany)
We examine lepton number violation (LNV) in theories with a saturated black hole bound on a large number of species. Such theories have been advocated recently as a possible solution to the hierarchy problem and an explanation of the smallness of neutrino masses. On the other hand, the violation of the lepton number can be a potential phenomenological problem of this N-copy extension of the standard model as due to the low quantum gravity scale black holes may induce TeV scale LNV operators generating unacceptably large rates of LNV processes. We show, however, that this issue can be avoided by introducing a spontaneously broken U{sub 1(B-L)}. Then, due to the existence of a specific compensation mechanism between contributions of different Majorana neutrino states, LNV processes in the standard model copy become extremely suppressed with rates far beyond experimental reach.
- OSTI ID:
- 21578153
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 83, Issue 5; Other Information: DOI: 10.1103/PhysRevD.83.051901; (c) 2011 American Institute of Physics; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BLACK HOLES
LEPTON NUMBER
MASS
MATHEMATICAL SOLUTIONS
NEUTRINOS
POTENTIALS
QUANTUM GRAVITY
STANDARD MODEL
TEV RANGE
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
GRAND UNIFIED THEORY
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
PARTICLE MODELS
QUANTUM FIELD THEORY
UNIFIED GAUGE MODELS