Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-02-10
Phys.Rev.Lett.93:051801,2004
Physics
High Energy Physics
High Energy Physics - Experiment
5 pages with 2 figures embeded in two column revtex4 style. Accepted to be published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.93.051801
We present a search for electron neutrino appearance from accelerator produced muon neutrinos in the K2K long baseline neutrino experiment. One candidate event is found in the data corresponding to an exposure of 4.8*10^19 protons on target. The expected background in the absence of neutrino oscillations is estimated to be 2.4+-0.6 events and is dominated by mis-identification of events from neutral current pi^0 production. We exclude the \nu_\mu to \nu_e oscillations at 90% C.L. for the effective mixing angle in 2-flavor approximation of sin^2(2theta_\mu_e) (~= 1/2 sin^2 2 th_13) > 0.15 at Delta m^2_\mu_e = 2.8*10^{-3} eV^2, the best fit value of the \nu_\mu disappearance analysis in K2K. The most stringent limit of sin^2(2theta_\mu_e) < 0.09 is obtained at Delta m^2_\mu_e = 6*10^{-3} eV^2.
Ahn Myoung-Hwan
K2K Collaboration
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