Matter Effects in Upward-Going Muons and Sterile Neutrino Oscillations

Abstract

The angular distribution of upward-going muons produced by atmospheric neutrinos in the rock below the MACRO detector show anomalies in good agreement with two flavor neutrino-mu ==> neutrino-tau oscillations with maximum mixing and Delta m**2 around 0.0024 eV**2. Exploiting the dependence of magnitude of the matter effect on oscillation channel, and using a set of 809 upward-going muons observed in MACRO, we show that the two flavor neutrino-mu ==> neutrino-sterile oscillation is disfavored with 99% C.L. with respect to neutrino-mu ==> neutrino-tau.

7 pages 4 figures Submitted to Physics Letters B

References in corpus (4)

• Tau Neutrinos Favored over Sterile Neutrinos in Atmospheric Muon Neutrino Oscillations
• Neutrino oscillations and large extra dimensions
• Low energy atmospheric muon neutrinos in MACRO
• Four-neutrino oscillation solutions of the atmospheric neutrino anomaly

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