CAN A NATURAL 3-GENERATION NEUTRINO MIXING SCHEME SATISFY EVERYTHING

Citation
Cy. Cardall et Gm. Fuller, CAN A NATURAL 3-GENERATION NEUTRINO MIXING SCHEME SATISFY EVERYTHING, Physical review. D. Particles and fields, 53(8), 1996, pp. 4421-4429
Citations number
65
Categorie Soggetti
Physics, Particles & Fields
ISSN journal
05562821
Volume
53
Issue
8
Year of publication
1996
Pages
4421 - 4429
Database
ISI
SICI code
0556-2821(1996)53:8<4421:CAN3NM>2.0.ZU;2-X
Abstract
We examine the potential for a ''natural'' three-neutrino mixing schem e to satisfy available data and astrophysical arguments. By ''natural' ' we mean no sterile neutrinos, and a neutrino mass hierarchy similar to that of the charged leptons. We seek to satisfy (or solve) (1) acce lerator and reactor neutrino oscillation constraints, including LSND, (2) the atmospheric muon neutrino deficit problem, (3) the solar neutr ino problem, (4) r-process nucleosynthesis in neutrino-heated supernov a ejecta, and (5) cold+hot dark matter models. We argue that putative supernova r-process nucleosynthesis bounds on two-neutrino flavor mixi ng can be applied directly to three-neutrino mixing in the case where one vacuum neutrino mass eigenvalue difference is dominated by the oth ers. We show that in this ''one mass scale dominance'' limit, a natura l three-neutrino oscillation solution meeting all the above constraint s exists only if the atmospheric neutrino data and the LSND data can b e explained with one neutrino mass difference. In this model, an expla nation for the solar neutrino data can be effected by employing the ot her independent neutrino mass difference. Such a solution is only marg inally allowed by the current data, and proposed long-baseline neutrin o oscillation experiments can definitively rule it out. If it were rul ed out, the simultaneous solution of the above constraints by neutrino oscillations would then require sterile neutrinos and/or a neutrino m ass hierarchy of a different nature than that of the charged leptons.