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Evidence for nu_mu -> nu_e Neutrino Oscillations from LSND

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arxiv nucl-ex/9709006 v1 pith:7XI3GVVJ submitted 1997-09-16 nucl-ex hep-ex

LSND Collaboration: C. Athanassopoulos , L.B. Auerbach , R.L. Burman , D.O. Caldwell , E.D. Church , I. Cohen , J.B. Donahue , A. Fazely
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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
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classification nucl-exhep-ex
keywords lsndoscillationaboveconsistenteventsevidenceoscillationsalamos
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A search for nu_mu -> nu_e oscillations has been conducted with the LSND apparatus at the Los Alamos Meson Physics Facility. Using nu_mu from pi^+ decay in flight, the nu_e appearance is detected via the charged-current reaction C(nu_e,e^-)X. Two independent analyses observe a total of 40 beam-on high-energy electron events (60 < E_e < 200 MeV) consistent with the above signature. This number is significantly above the 21.9 +- 2.1 events expected from the nu_e 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 nu_mu_bar -> nu_e_bar oscillation evidence from LSND.

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