Dirac neutrino dark matter
- Laboratoire de Physique Theorique LAPTH, F-74941 Annecy-le-Vieux (France)
- Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119992 (Russian Federation)
- CERN Physics Department, Theory Division, CH-1211 Geneva 23 (Switzerland)
We investigate the possibility that dark matter is made of heavy Dirac neutrinos with mass m element of [O(1) GeV-a few TeV] and with suppressed but non-zero coupling to the standard model Z as well as a coupling to an additional Z' gauge boson. The first part of this paper provides a model-independent analysis for the relic density and direct detection in terms of four main parameters: the mass, the couplings to the Z, to the Z' and to the Higgs. These WIMP candidates arise naturally as Kaluza-Klein states in extra-dimensional models with extended electroweak gauge group SU(2){sub L} Multiplication-Sign SU(2){sub R} Multiplication-Sign U(1). They can be stable because of Kaluza-Klein parity or of other discrete symmetries related to baryon number for instance, or even, in the low mass and low coupling limits, just because of a phase-space-suppressed decay width. An interesting aspect of warped models is that the extra Z' typically couples only to the third generation, thus avoiding the usual experimental constraints. In the second part of the paper, we illustrate the situation in details in a warped grand unified theory model.
- OSTI ID:
- 22137754
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2008, Issue 01; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
Similar Records
Relaxing constraints from lepton flavor violation in 5D flavorful theories
CERN LHC signals for warped electroweak neutral gauge bosons