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 ν 2 neutrino lifetime at τ 2 / m 2 ≥ 7.2 × 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.