Latest Results from the K2K experiment
Abstract
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 μ disappearance that is observed in atmospheric neutrinos. With nearly pure muon neutrino beam produced with 5.6× 1019 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 1020 protons on target, providing sufficient statistics to study neutrino oscillations by spectral analysis for μ disappearance.
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