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Résumé |
Due to finite masses and mixing, for neutrinos propagate in space-time, there is a transition
between left- and right- handed neutrinos, termed chiral rotation, besides the usual oscillation
governed by the Dirac equation. The probability of chiral oscillation is suppressed by a factor m^2/E^2.
For non-relativistic neutrinos, this effects can be significant. In matter, the equation of motion is
modified. This changes the behaviors of the oscillations. Neutrinos produced in weak interaction
after passing through the matter, the effective energies are split into two different ones depending on
the helicity of the neutrino. This results in different oscillation behavior for neutrinos with different
helicity, in particular there is a resonant effect for the left-handed neutrino of negative helicity into
right-handed neutrino of negative helicity. Chiral rotation pattern also depends on Majorana phases
in Seesaw models. |
