Tau Neutrinos Favored over Sterile Neutrinos in Atmospheric Muon Neutrino Oscillations

Abstract

The previously published atmospheric neutrino data did not distinguish whether muon neutrinos were oscillating into tau neutrinos or sterile neutrinos, as both hypotheses fit the data. Using data recorded in 1100 live-days of the Super-Kamiokande detector, we use three complementary data samples to study the difference in zenith angle distribution due to neutral currents and matter effects. We find no evidence favoring sterile neutrinos, and reject the hypothesis at the 99% confidence level. On the other hand, we find that oscillation between muon and tau neutrinos suffices to explain all the results in hand.

9 pages with 2 figures, submitted to PRL

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• Measurement of the flux and zenith-angle distribution of upward through-going muons by Super-Kamiokande
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• Protecting the primordial baryon asymmetry in the seesaw model compatible with WMAP and KamLAND
• Lepton flavor violating signals of the neutral top-pion in future lepton colliders
• Supersymmetric Model of Muon Anomalous Magnetic Moment and Neutrino Masses
• Probing CP violation in the neutrino sector with magic baseline experiments
• Impact of standard neutrino oscillations and systematics in proton lifetime measurements
• Atmospheric neutrinos, $n{u}_e-n{u}_s$ oscillations, and a novel neutrino evolution equation
• Weighing Neutrinos with Large-Scale Structure
• A Model of Fermion Masses and Flavor Mixings with Family Symmetry $SU(3)\otimes U(1)$
• New Perspective on Fermion Mass Matrices
• Solutions of the atmospheric, solar and LSND neutrino anomalies from TeV scale quark-lepton unification
• MACRO constraints on violation of Lorentz invariance
• Preserving the Lepton Asymmetry in the Brane World
• Physics at an Upgraded Fermilab Proton Driver
• Non-standard Neutrino Properties
• A hidden hierarchy of neutrino masses
• Double Threefold Degeneracies for Active and Sterile Neutrinos
• Confronting Heavy Tau Neutrinos with Neutrino Oscillations
• A Model for Neutrino Warm Dark Matter and Neutrino Oscillations
• Nambu-Goldstone Bosons in CP Violating theory with Majorana Masses
• Influence of second-order corrections to the energy-dependence of neutrino flavor conversion formulae
• Nostos - Spherical TPCs
• Role of lepton flavor violating (LFV) muon decay in Seesaw model and LSND
• Unified Supersymmetric Model of Naturally Small Dirac Neutrino Masses and the Axionic Solution of the Strong CP Problem
• Neutrino Oscillations Due to Nonuniversal Gauge Interactions in the Weak Sector
• Absorption of solar radiation by solar neutrinos
• Simple description of neutrinos in SU(5)
• Pionic Contribution to Neutrinoless Double Beta Decay
• Neutrino oscillation in the presence of background classical sources
• GUT Implications from Neutrino Mass
• Leptogenesis and CP Violation in Neutrino Oscillations
• Neutrino physics from cosmological observations
• A note on the neutrino mass implications of the K2K experiment
• Neutrino physics from Cosmology
• Search for exotic contributions to atmospheric neutrino oscillations
• Search for a Lorentz invariance violation in atmospheric neutrino oscillations using MACRO data
• A method for detecting ${\nu }_{\tau }$ appearance in the spectra of quasielastic CC events
• Four-neutrino mixing solutions of the atmospheric neutrino anomaly
• $\nu -K^0$ Analogy, Dirac-Majorana Neutrino Duality and the Neutrino Oscillations
• What are the neutrino masses. Mixing