Neutrino mixing, CP and T violation, and textures in four-neutrino models
- Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
- Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080 (China)
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
We examine the prospects for determining the neutrino mixing matrix and for observing CP and T violation in neutrino oscillations in four-neutrino models. We focus on a general class of four-neutrino models with two pairs of nearly degenerate mass eigenstates separated by approximately 1 eV, which can describe the solar, atmospheric and LSND neutrino data. We present a general parametrization of these models and discuss in detail the determination of the mixing parameters and the mass matrix texture from current and future neutrino data in the case where {nu}{sub e} and {nu}{sub {mu}} each mix primarily with one other neutrino. We find that measurable CP or T violation in long-baseline experiments, with amplitude at the level of the LSND signal, is possible given current experimental constraints. Also, additional oscillation effects in short- and long-baseline experiments may be measurable in many cases. We point out that, given separate scales for the mass-squared differences of the solar and atmospheric oscillations, observable CP or T violation effects in neutrino oscillations signal the existence of a sterile neutrino. We examine several textures of the neutrino mass matrix and determine which textures can have measurable CP or T violation in neutrino oscillations in long-baseline experiments. We also briefly discuss some possible origins of the neutrino mass terms in straightforward extensions of the standard model. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 338714
- Journal Information:
- Physical Review, D, Vol. 59, Issue 11; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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