Limits on Neutrino Oscillations from the CHOOZ Experiment

M. Apollonio , A. Baldini , C. Bemporad , E. Caffau , F. Cei , Y. Declais , H. de Kerret , B. Dieterle

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A. Etenko L. Foresti J. George G. Giannini M. Grassi Y. Kozlov W. Kropp D.Kryn M. Laiman C.E. Lane B. Lefievre I. Machulin A. Martemyanov V. Martemyanov L. Mikaelyan D. Nicolo M. Obolensky R. Pazzi G. Pieri L. Price S. Riley R. Reeder A. Sabelnikov G. Santin M. Skorokhvatov H. Sobel J. Steele R. Steinberg S. Sukhotin S. Tomshaw D. Veron V. Vyrodov

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classification ✦ hep-ex

keywords antichoozdeltaneutrinooscillationsresultsabsoluteapproximately

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We present new results based on the entire CHOOZ data sample. We find (at 90% confidence level) no evidence for neutrino oscillations in the anti_nue disappearance mode, for the parameter region given by approximately Delta m**2 > 7 x 10**-4 eV^2 for maximum mixing, and sin**2(2 theta) = 0.10 for large Delta m**2. Lower sensitivity results, based only on the comparison of the positron spectra from the two different-distance nuclear reactors, are also presented; these are independent of the absolute normalization of the anti_nue flux, the cross section, the number of target protons and the detector efficiencies.

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Limits on Neutrino Oscillations from the CHOOZ Experiment

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