Atmospheric and solar neutrinos with a heavy singlet

被引:210
作者
King, SF [1 ]
机构
[1] CERN, Div Theory, CH-1211 Geneva 23, Switzerland
关键词
D O I
10.1016/S0370-2693(98)01055-7
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We follow a minimalistic approach to neutrino masses, by introducing a single heavy singlet N into the standard model (or supersymmetric standard model) with a heavy Majorana mass M,which couples as a single right-handed neutrino in a Dirac fashion to leptons, and induces a single light see-saw mass m(nu) similar to 5 x 10(-2) eV, leaving two neutrinos massless. This trivial extension to the standard model may account for the atomospheric neutrino data via nu(mu) --> nu(tau) oscillations with near maximal mixing angle theta(23) similar to pi/4 and Delta(mu tau)(2) similar to 2.5 x 10(-3) eV(2). In order to account for the solar neutrino data the model is extended to SUSY GUT/ string-inspired type models which can naturally yield an additional light tau neutrino mass m(nu tau) similar to few x 10(-3) eV leading to nu(eL) --> (cos theta(23) nu(mu L) - sin theta(23)nu(tau L)) oscillations with Delta m(e1)(2) similar to 10(-5) eV(2) and a mixing angle sin(2)2 theta(1) approximate to 10(-2) in the correct range for the small angle MSW solution to the solar neutrino problem. The model predicts nu(eL) --> (sin theta(23)nu(mu L) + cos theta(23)nu(tau L)) oscillations with a similar angle but a larger splitting Delta m(e2)(2) similar to 2.5 x 10(-3) eV(2). (C) 1998 Published by Elsevier Science B.V. All rights reserved.
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页码:350 / 356
页数:7
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