CAP Congress Abstract
Scott Oser
oser@physics.ubc.ca

Long-baseline Neutrino Oscillations at K2K and J-PARC
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Intense neutrino beams produced by accelerators can be exploited by
long-baseline oscillation experiments to measure neutrino mixing
parameters.  By comparing the flux and flavour content of the beam at
its production site to the beam composition at a far detector located
hundreds of kilometers away, transition probabilities between neutrino
flavours can be measured as a function of neutrino energy, probing the
oscillation pattern.  The K2K experiment uses a muon neutrino beam
produced at KEK, Japan and directed towards the Super-Kamiokande
detector to measure neutrino masses and mixing angles associated with
atmospheric neutrino oscillations.  A future long-baseline experiment
will direct a high-intensity beam from the J-PARC proton driver in
Tokai, Japan towards Super-Kamiokande, with the goal of measuring the
muon neutrino to electron neutrino conversion probability.  The J-PARC
neutrino project was funded in December 2003.  A future phase of the
J-PARC project will attempt to observe CP violation effects in
neutrino oscillations by comparing the muon neutrino to electron
neutrino oscillation probability with the oscillation probability for
antineutrinos.  CP violation by neutrinos may have produced the
matter-antimatter asymmetry observed in the universe today by a
leptogenesis mechanism.