TY - JOUR
T1 - The dark side of the solar neutrino parameter space
AU - Gouvêa, André de
AU - Friedland, Alexander
AU - Murayama, Hitoshi
N1 - Funding Information:
This work was supported in part by the US Department of Energy under Contract DE-AC03-76SF00098 and in part by the National Science Foundation under grant PHY-95-14797.
PY - 2000/9/28
Y1 - 2000/9/28
N2 - Results of neutrino oscillation experiments have always been presented on the (sin22θ, Δm2) parameter space for the case of two-flavor oscillations. We point out, however, that this parameterization misses the half of the parameter space π/4 < θ ≤ π/2 ('the dark side'), which is physically inequivalent to the region 0 ≤ θ ≤ π/4 ('the light side') in the presence of matter effects. The MSW solutions to the solar neutrino problem can extend to the dark side, especially if we take the conservative attitude to allow higher confidence levels, ignore some of the experimental results in the fits, or relax theoretical predictions. Furthermore, even the so-called 'vacuum oscillation' solution distinguishes the dark and the light sides. We urge experimental collaborations to present their results on the entire parameter space. (C) 2000 Elsevier Science B.V.
AB - Results of neutrino oscillation experiments have always been presented on the (sin22θ, Δm2) parameter space for the case of two-flavor oscillations. We point out, however, that this parameterization misses the half of the parameter space π/4 < θ ≤ π/2 ('the dark side'), which is physically inequivalent to the region 0 ≤ θ ≤ π/4 ('the light side') in the presence of matter effects. The MSW solutions to the solar neutrino problem can extend to the dark side, especially if we take the conservative attitude to allow higher confidence levels, ignore some of the experimental results in the fits, or relax theoretical predictions. Furthermore, even the so-called 'vacuum oscillation' solution distinguishes the dark and the light sides. We urge experimental collaborations to present their results on the entire parameter space. (C) 2000 Elsevier Science B.V.
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U2 - 10.1016/S0370-2693(00)00989-8
DO - 10.1016/S0370-2693(00)00989-8
M3 - Article
AN - SCOPUS:0004424098
VL - 490
SP - 125
EP - 130
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 1-2
ER -