Neutrino Decay and Solar Neutrino Seasonal Effect

Abstract

We consider the possibility of solar neutrino decay as a sub-leading effect on their propagation between production and detection. Using current oscillation data, we set a new lower bound to the ${\nu }_2$ neutrino lifetime at ${\tau }_2/m_2\ge 7.2\times 10^{-4}s.{eV}^{-1}$ at $99\%$C.L.. Also, we show how seasonal variations in the solar neutrino data can give interesting additional information about neutrino lifetime.

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