Long-baseline neutrino oscillation experiments and CP violation in the lepton sector

Abstract

We discuss possibilities to investigate the effects of CP (and T) violation in the lepton sector in neutrino oscillation experiments. We consider the effects of CP violation in the framework of two schemes of mixing of four massive neutrinos that can accommodate the results of all neutrino oscillation experiments. Using the constraints on the mixing parameters that follow from the results of short-baseline neutrino oscillation experiments, we derive rather strong upper bounds on the effects of CP violation in nu_mu<->nu_e transitions in long-baseline neutrino oscillation experiments. We show that the effects of CP violation in nu_mu<->nu_tau transitions in long-baseline oscillation experiments can be as large as is allowed by the unitarity of the mixing matrix. The matter effects, which complicate the problem of searching for CP violation in long-baseline experiments, are discussed in detail. We consider the T-odd asymmetries whose measurement could allow to reveal T and CP violation in the lepton sector independently from matter effects.

31 pages, including 5 figures

References in corpus (5)

• Initial Results from the CHOOZ Long Baseline Reactor Neutrino Oscillation Experiment
• How to Measure CP Violation in Neutrino Oscillation Experiments?
• CP Violation vs. Matter Effect in Long-Baseline Neutrino Oscillation Experiments
• Bounds on long-baseline nu_e->nu_e and nu_mu->nu_e transition probabilities
• Constraints on long-baseline neutrino oscillation probabilities and CP asymmetries from neutrino oscillation data

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