非表示:
キーワード:
High Energy Physics - Phenomenology, hep-ph,High Energy Physics - Experiment, hep-ex
要旨:
The discovery of leptonic CP violation is one of the primary goals of
next-generation neutrino oscillation experiments, which is feasible due to the
recent measurement of a relatively large leptonic mixing angle \theta_{13}. We
suggest two new working observables \Delta A^{\rm m}_{\alpha \beta} \equiv
\max[A^{\rm CP}_{\alpha \beta}(\delta)] - \min[A^{\rm CP}_{\alpha
\beta}(\delta)] and \Delta A^{\rm CP}_{\alpha \beta}(\delta) \equiv A^{\rm
CP}_{\alpha \beta}(\delta) - A^{\rm CP}_{\alpha \beta}(0) to describe the
CP-violating effects in long-baseline and atmospheric neutrino oscillation
experiments. The former signifies the experimental sensitivity to the leptonic
Dirac CP-violating phase $\delta$ and can be used to optimize the experimental
setup, while the latter measures the intrinsic leptonic CP violation and can be
used to extract $\delta$ directly from the experimental observations. Both
analytical and numerical analyses are carried out to illustrate their main
features. It turns out that an intense neutrino beam with sub-GeV energies and
a baseline of a few 100 km may serve as an optimal experimental setup for
probing leptonic CP violation.
