Evidence for nu_mu -> nu_e 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

doi:10.1103/physrevc.58.2489

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arXiv · nucl-ex/9706006

Evidence for nu_mu -> nu_e Oscillations from Pion Decay in Flight Neutrinos

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Abstract

A search for nu_mu -> nu_e oscillations has been conducted at the Los Alamos Meson Physics Facility using nu_mu from pi^+ decay in flight. An excess in the number of beam-related events from the C(nu_e,e^-)X inclusive reaction is observed. The excess is too large to be explained by normal nu_e 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 nu_mu_bar -> nu_e_bar oscillation evidence from LSND.

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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. 1997-06-13. Evidence for nu_mu -> nu_e Oscillations from Pion Decay in Flight Neutrinos. https://doi.org/10.1103/physrevc.58.2489

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