669 research outputs found
A Search for Muon-neutrino to Electron-neutrino and Muon-antineutrino to Electron-antineutrino Oscillations at NuTeV
Limits on and oscillations
are extracted using the NuTeV detector with sign-selected and
\nub_\mu beams. In \nub_\mu mode, for the case of ,
is excluded, and for
, . The NuTeV data exclude the
high end of oscillations parameters
favored by the LSND experiment without the need to assume that the oscillation
parameters for and \nub are the same. We present the most stringent
experimental limits for
oscillations in the large region.Comment: 4 pages, 3 figures. Submitted to Phys. Rev. Letters, UR-164
A High Statistics Search for Electron-Neutrino --> Tau-Neutrino Oscillations
We present new limits on nu_e to nu_tau and nu_e to nu_sterile oscillations
by searching for electron neutrino dissappearance in the high-energy wide-band
CCFR neutrino beam. Sensitivity to nu_tau appearance comes from tau decay modes
in which a large fraction of the energy deposited is electromagnetic. The beam
is composed primarily of muon neutrinos but this analysis uses the 2.3%
electron neutrino component of the beam. Electron neutrino energies range from
30 to 600 GeV and flight lengths vary from 0.9 to 1.4 km. This limit improves
the sensitivity of existing limits and obtains a lowest 90% confidence upper
limit in sin**2(2*alpha) of 9.9 x 10**(-2) at delta-m**2 of 125 eV**2.Comment: submitted to Phys. Rev. D. Rapid Com
A new ordering principle for the classical statistical analysis of Poisson processes with background
Inspired by the recent proposal by Feldman and Cousins of a ``unified
approach to the classical statistical analysis of small signals'' based on a
choice of ordering in Neyman's construction of classical confidence intervals,
I propose a new ordering principle for the classical statistical analysis of
Poisson processes with background which minimizes the effect on the resulting
confidence intervals of the observation of less background events than
expected. The new ordering principle is applied to the calculation of the
confidence region implied by the recent null result of the KARMEN neutrino
oscillation experiment.Comment: 16 pages including 5 figures, RevTeX. Final version published in
Phys. Rev. D 59 (1999) 05300
Statistical Analysis of Different Muon-antineutrino->Electron-antineutrino Searches
A combined statistical analysis of the experimental results of the LSND and
KARMEN \numubnueb oscillation search is presented. LSND has evidence for
neutrino oscillations that is not confirmed by the KARMEN experiment. This
joint analysis is based on the final likelihood results for both data sets. A
frequentist approach is applied to deduce confidence regions. At a combined
confidence level of 36%, there is no area of oscillation parameters compatible
with both experiments. For the complementary confidence of 1-0.36=64%, there
are two well defined regions of oscillation parameters (sin^2(2th),Dm^2)
compatible with both experiments.Comment: 25 pages, including 10 figures, submitted to Phys. Rev.
A Precise Determination of Electroweak Parameters in Neutrino-Nucleon Scattering
The NuTeV collaboration has extracted sin^2theta_W from the ratios of neutral
current to charged current neutrino and anti-neutrino cross-sections. Our
value, sin^2theta_W(on-shell)=0.2277+/-0.0013(stat)+/-0.0009(syst), is three
standard deviations above the standard model prediction. We also present a
model independent analysis of the same data.Comment: ReVTeX, 5 pp, 1fig; v2. revised SM prediction; v3. more sig. digits
in Eqns 6-7, fix error in Eqn
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