A four-neutrino mixing scheme for observed neutrino data
S. C. Gibbons, R. N. Mohapatra, S. Nandi, A. Raychaudhuri
Abstract
It has been observed that simultaneous explanation of the solar and atmospheric neutrino deficits and the reported evidence for νμ νe oscillation from the Los Alamos Liquid Scintillator Detector (LSND) requires at least one extra neutrino species in addition to the three known ones. The extra neutrino must be sterile with respect to the known weak interactions. We present a new mass matrix for these four neutrinos in which the LSND effect and the atmospheric neutrino deficit are governed by only one parameter. We investigate the phenomenological implications of such a mass matrix ansatz and suggest possible ways to understand it in gauge theories.
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