Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-02-10
Phys.Lett.B675:69-72,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 3 color figures, LaTeX, elsarticle.sty
Scientific paper
10.1016/j.physletb.2009.03.038
Parametric enhancement of the appearance probability of the neutrino oscillation under the inhomogeneous matter is studied. Fourier expansion of the matter density profile leads to a simple resonance condition and manifests that each Fourier mode modifies the energy spectrum of oscillation probability at around the corresponding energy; below the MSW resonance energy, a large-scale variation modifies the spectrum in high energies while a small-scale one does in low energies. In contrast to the simple parametric resonance, the enhancement of the oscillation probability is itself an slow oscillation as demonstrated by a numerical analysis with a single Fourier mode of the matter density. We derive an analytic solution to the evolution equation on the resonance energy, including the expression of frequency of the slow oscillation.
Koike Masafumi
Ota Toshihiko
Saito Masako
Sato Joe
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