Maximal ${\nu }_e$ oscillations, Borexino and smoking guns

Abstract

We examine the maximal ${\nu }_e-->{\nu }_s$ and ${\nu }_e-->{\nu }_{\mu },\tau$ oscillation solutions to the solar neutrino problem. These solutions lead to roughly a 50% solar flux reduction for the large parameter range $3\times 10^{-10}<\delta m^2/e{V}^2<10^{-3}$. It is known that the earth regeneration effect may cause a potentially large night-day asymmetry even for maximal neutrino oscillations. We investigate the night-day asymmetry predictions for the forthcoming Borexino measurement of the ^7Be neutrinos for both maximal ${\nu }_e-->{\nu }_s$ and ${\nu }_e-->{\nu }_{\mu },\tau$ oscillations. If $y\times 10^{-8}<\delta m^2/e{V}^2<4y\times 10^{-5}$ (with y = 0.5 for ${\nu }_e-->{\nu }_s$ case and y = 1 for ${\nu }_e-->{\nu }_{\mu },\tau$ case) then the maximal neutrino oscillations will lead to observable night-day asymmetries in Borexino and/or superKamiokande. With Kamland covering the high mass range, $10^{-5}<\delta m^2/e{V}^2<10^{-3}$ and Borexino/superK covering the low mass range, $3\times 10^{-10}<\delta m^2/e{V}^2<5\times 10^{-9}$ ("just so" region), essentially all of the $\delta m^2$ parameter space will soon be scrutinized.

Various improvements...still about 6 pages with some figs

References in corpus (3)

• Seasonal Variations of the 7Be Solar Neutrino Flux
• Day-Night and Energy Dependence of MSW Solar Neutrinos for Maximal Mixing
• Maximal ${\nu }_e\to {\nu }_s$ solution to the solar neutrino problem: just-so, MSW or energy independent?

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• Status of the Gribov-Pontecorvo Solution to the Solar Neutrino Problem
• Maximal ${\nu }_{\mu }-{\nu }_{\tau }$ oscillations, the see-saw mechanism and the Exact Parity Model
• Solutions of the atmospheric, solar and LSND neutrino anomalies from TeV scale quark-lepton unification