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Evidence for numu -> nue Neutrino Oscillations from LSND

LSND Collaboration, C. Athanassopoulos, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, I. Cohen, 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, 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

nucl-exarXiv:nucl-ex/9709006

Abstract

A search for numu -> nue oscillations has been conducted with the LSND apparatus at the Los Alamos Meson Physics Facility. Using numu from pi+ decay in flight, the nue appearance is detected via the charged-current reaction C(nue,e-)X. Two independent analyses observe a total of 40 beam-on high-energy electron events (60 < Ee < 200 MeV) consistent with the above signature. This number is significantly above the 21.9 +- 2.1 events expected from the nue contamination in the beam and the beam-off background. 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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