München 2009 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 20: Neutrinophysik (Theorie) 1

T 20.7: Vortrag

Donnerstag, 12. März 2009, 18:15–18:30, M109

Resonant active-sterile neutrino mixing in the presence of matter potentials and altered dispersion relations — •Sebastian Hollenberg and Heinrich Päs — Technische Universität Dortmund, Theoretische Physik III, 44221 Dortmund, Germany

We examine the resonance structure in a two state active-sterile neutrino oscillation scheme in the presence of matter effects and altered dispersion relations. Matter potentials in the (flavour space) Schrödinger equation describing neutrino oscillations arise due to coherent elastic forward scattering of neutrinos in matter, whereas altered dispersion relations may arise in scenarios allowing for extra-dimensional shortcuts or Lorentz invariance violation.

We show that combining matter effects and altered dispersion relations gives rise to new resonance features in the oscillation probability. The resonance structure does depend on the mass hierarchy of active and sterile neutrinos as well as on whether we are considering particles or antiparticles. Moreover it is shown that combining matter and altered dispersion relations effects lead to narrower resonances as compared to altered dispersion relations in vacuo.