Evidence for numu -> nue Oscillations from Pion Decay in Flight Neutrinos
LSND Collaboration, C. Athanassopoulos, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, I. Cohen, B. D. Dieterle, J. B. Donahue, A. Fazely, F. J. Federspiel, G. T. Garvey, R. M. Gunasingha, R. Imlay, K. Johnston, H. J. Kim, W. C. Louis, R. Majkic, J. Margulies, K. McIlhany, W. Metcalf, G. B. Mills, R. A. Reeder, V. Sandberg, D. Smith, I. Stancu, W. Strossman, R. Tayloe, G. J. VanDalen, W. Vernon, N. Wadia, J. Waltz, D. H. White, D. Works, Y. Xiao, S. Yellin
Abstract
A search for numu -> nue oscillations has been conducted at the Los Alamos Meson Physics Facility using numu from pi+ decay in flight. An excess in the number of beam-related events from the C(nue,e-)X inclusive reaction is observed. The excess is too large to be explained by normal nue contamination in the beam at a confidence level greater than 99%. If interpreted as an oscillation signal, the observed oscillation probability of (2.6 +- 1.0 +- 0.5) x 10-3 is consistent with the previously reported numubar -> nuebar oscillation evidence from LSND.
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