728 research outputs found
New Results from the MINOS Experiment
In this paper we present the latest results from the MINOS Experiment. This
includes a new measurement of the atmospheric neutrino oscillation parameters
based on 3.36 x 10^20 protons-on-target of data and a first analysis of neutral
current events in the Far Detector. The prospects for nu-e appearance
measurements in MINOS are also discussed.Comment: 6 pages, 4 figures, for the Proceedings of the Neutrino 2008
Conference, Christchurch, N
Observation of muon neutrino disappearance with the MINOS detectors in the NuMI neutrino beam
This letter reports results from the MINOS experiment based on its initial exposure to neutrinos from the Fermilab NuMI beam. The rate and energy spectra of charged current muon neutrino interactions are compared in two detectors located along the beam axis at distances of 1 km and 735 km. With 1.27 x 10^{20} 120 GeV protons incident on the NuMI target, 215 events with energies below 30 GeV are observed at the Far Detector, compared to an expectation of 336 \pm 14.4 events. The data are consistent with muon neutrino disappearance via oscillation with |\Delta m^2_{23}| = 2.74^{+0.44}_{-0.26} x 10^{-3} eV^2/c^4 and sin^2(2\theta_{23}) > 0.87 (at 60% C.L.)
Charged Cosmic String Nucleation in de Sitter Space
We investigate the quantum nucleation of pairs of charged circular cosmic
strings in de Sitter space. By including self-gravity we obtain the classical
potential energy barrier and compute the quantum mechanical tunneling
probability in the semiclassical approximation. We also discuss the classical
evolution of charged circular strings after their nucleation.Comment: 12 pages Latex + 3 figures (not included), Nordita 94/38
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