Measurement of the L/E distributions of atmospheric ν in Soudan 2 and their interpretation as neutrino oscillations

M. Sanchez, W. W.M. Allison, G. J. Alner, D. S. Ayres, W. L. Barrett, P. M. Border, J. H. Cobb, D. J.A. Cockerill, H. Courant, D. M. Demuth, T. H. Fields, H. R. Gallagher, M. C. Goodman, T. Joffe-Minor, T. Kafka, S. M.S. Kasahara, P. J. Litchfield, W. A. Mann, M. L. Marshak, R. H. MilburnW. H. Miller, L. Mualem, J. K. Nelson, A. Napier, W. P. Oliver, G. F. Pearce, E. A. Peterson, D. A. Petyt, K. Ruddick, J. Schneps, A. Sousa, B. Speakman, J. L. Thron, N. West

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Abstract

A deficit of atmospheric νμ events, consistent with the hypothesis of neutrino oscillations, is observed in the 5.90 kiloton-year fiducial exposure of the Soudan 2 detector. An unbinned maximum likelihood analysis of the neutrino LIE distribution has been carried out using the Feldman-Cousins prescription. The probability of the no oscillation hypothesis is 5.8×10-4. The 90% confidence allowed region in the sin 22θ,Δm2 plane is presented. The region includes the 90% confidence allowed region of the Super-K experiment.

Original languageEnglish (US)
Article number113004
JournalPhysical Review D
Volume68
Issue number11
DOIs
StatePublished - Dec 29 2003

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