Survival Rates in Megaton Water C̆erenkov Detectors
نویسندگان
چکیده
The neutrino mass hierarchy, presently unknown, is a powerful discriminator among various classes of unification theories. We show that the νμ + ν̄μ survival rate in atmospheric events can provide a novel method of determining the hierarchy in megaton water C̆erenkov detectors. For pathlength and energy ranges relevant to atmospheric neutrinos, this rate obtains significant matter sensitive variations not only from resonant matter effects in Pμe but also from those in Pμτ . We calculate the expected muon event rates in the case of matter oscillations with both natural and inverted hierarchy. We identify the energy and pathlength ranges for which resonant matter effects can lead to observable differences between the above two cases. We also estimate the exposure time required to observe this difference and determine the sign of ∆31 in a statistically significant manner. Email: [email protected] Email: [email protected] Email: [email protected] Email: [email protected], [email protected] Email: [email protected]
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