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 ${\nu }_{\mu }$ 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 $80.6_{-8.0}^{+7.3}$ 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.

Talk presented at the XXXVIIth Rencontres de Moriond "Electroweak Interactions and Unified Theories", Les Arcs, Savoie, France, March 9-16, 2002

Cited by in corpus (1)

• Lepton-Flavor Violating Decay of Tau Lepton in the Supersymmetric Seesaw Model