Neutrino oscillation effects in Soudan 2 upward-stopping muons

W. W.M. Allison, G. J. Alner, D. S. Ayres, G. D. Barr, 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. Kafka, S. M.S. Kasahara, P. J. Litchfield, W. A. Mann, M. L. Marshak, W. H. Miller, L. MualemJ. K. Nelson, A. Napier, W. P. Oliver, G. F. Pearce, E. A. Peterson, D. A. Petyt, K. Ruddick, M. Sanchez, J. Schneps, A. Sousa, J. L. Thron, N. West

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Abstract

Upward-going stopping muons initiated by atmospheric νμ and ν̄μ interactions in the rock below the Soudan 2 detector have been isolated, together with a companion sample of neutrino-induced single muons, created within the detector, which travel downwards and exit. The downward-going sample is consistent with the atmospheric-neutrino flux prediction, but the upward-going sample exhibits a sizable depletion. Both are consistent with previously reported Soudan 2 neutrino-oscillation results. Inclusion of the two samples in an all-event likelihood analysis, using recent 3D-atmospheric- neutrino-flux calculations, reduces both the allowed oscillation parameter region and the probability of the no-oscillation hypothesis.

Original languageEnglish (US)
Article number052005
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume72
Issue number5
DOIs
StatePublished - Sep 1 2005

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