Speaker
Description
We study the possibility of measuring T (time reversal) violation in a future
long-baseline neutrino oscillation experiment. By assuming a neutrino factory as a
staging scenario of a muon collider at the J-PARC site, we find that the \nu_e → \nu_\mu oscillation probabilities can be measured with a good accuracy at the Hyper-
Kamiokande detector. By comparing with the probability of the time-reversal
process, \nu_\mu → \nu_e, measured at the T2K/T2HK experiments, one can determine
the CP phase δ in the neutrino mixing matrix if | sin(δ)| is large enough. The
determination of δ can be made with poor knowledge of the matter density of the
earth as T violation is almost insensitive to the matter effects. The comparison
of CP and T-violation measurements, `a la the CPT theorem, provides us with
a non-trivial check of the three neutrino paradigm based on the quantum field
theory.
| Working Group | WG 1: Neutrino Oscillation Physics |
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