Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-06-17
Physics
High Energy Physics
High Energy Physics - Experiment
Talk presented at the XXXVIIth Rencontres de Moriond "Electroweak Interactions and Unified Theories", Les Arcs, Savoie, France
Scientific paper
The KEK to Kamioka long-baseline neutrino experiment (K2K) is the first accelerator-based experiment with hundreds of km neutrino path length. K2K focuses on the study of the existence of neutrino oscillations in $\nu_{\mu}$ disappearance that is observed in atmospheric neutrinos. With nearly pure muon neutrino beam produced with $5.6\times 10^{19}$ protons from 12 GeV PS on target, 56 neutrino events have been observed at Super-Kamiokande, the far detector at 250 km distance. The expectation is $80.6^{+7.3}_{-8.0}$ derived from the measurement at the near site. The experiment expects to accumulate $10^{20}$ protons on target, providing sufficient statistics to study neutrino oscillations by spectral analysis for $\nu_{\mu}$ disappearance.
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