Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-09-26
Phys.Rev. D63 (2001) 073012
Physics
High Energy Physics
High Energy Physics - Phenomenology
RevTex 19 pages. Some changes. Phys. Rev. D (in printing)
Scientific paper
10.1103/PhysRevD.63.073012
We introduce the commutators of lepton mass matrices to describe the phenomenon of lepton flavor mixing, and establish their relations to the effective Hamiltonians responsible for the propagation of Dirac and Majorana neutrinos. The determinants of those commutators are invariant under matter effects, leading to an instructive relationship between the universal CP-violating parameters in vacuum and in matter. In the scenario of low-energy (100 MeV \leq E \leq 1 GeV) and medium-baseline (100 km \leq L \leq 400 km) neutrino experiments, we illustrate the features of lepton flavor mixing and CP violation. The terrestrial matter effects on CP- and T-violating asymmetries in \nu_\mu \to \nu_e and $\bar{\nu}_\mu \to \bar{\nu}_e neutrino oscillations are also discussed. We demonstrate that a relatively pure signal of leptonic CP violation at the percent level can be established from such medium-baseline experiments with low-energy neutrino beams.
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