Direct test of the MSW effect by the solar appearance term in beam experiments

Abstract

We discuss if one can verify the MSW effect in neutrino oscillations at a high confidence level in long-baseline experiments. We demonstrate that for long enough baselines at neutrino factories, the matter effect sensitivity is, as opposed to the mass hierarchy sensitivity, not suppressed by ${\sin }^{2}2{\theta }_{13}$ because it is driven by the solar oscillations in the appearance probability. Furthermore, we show that for the parameter independent direct verification of the MSW effect at long-baseline experiments, a neutrino factory with a baseline of at least 6000 km is needed. For superbeams, we do not find a $5\sigma$ discovery potential of the MSW effect independent of ${\sin }^{2}2{\theta }_{13}$. We finally summarize different methods to test the MSW effect.

Minor changes, references updated; somewhat shorter version appeared in Phys. Lett. B; 9 pages, 2 figures

References in corpus (1)

• Solar Neutrinos Before and After Neutrino 2004

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