Sterile-active neutrino oscillations and shortcuts in the extra dimension

Apr, 2005
23 pages
Published in:
  • Phys.Rev.D 72 (2005) 095017
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Abstract:
We discuss a possible new resonance in active-sterile neutrino oscillations arising in theories with large extra dimensions. Fluctuations in the brane effectively increase the path-length of active neutrinos relative to the path-length of sterile neutrinos through the extra-dimensional bulk. Well below the resonance, the standard oscillation formulas apply. Well above the resonance, active-sterile oscillations are suppressed. We show that a resonance energy in the range of 30-400 MeV allows an explanation of all neutrino oscillation data, including LSND data, in a consistent four-neutrino model. A high resonance energy implies an enhanced signal in MiniBooNE. A low resonance energy implies a distorted energy spectrum in LSND, and an enhanced v_mu depletion from a stopped-pion source. The numerical value of the resonance energy may be related back to the geometric aspects of the brane world. Some astrophysical and cosmological consequences of the brane-bulk resonance are briefly sketched.
  • 14.60.St
  • 11.25.Wx
  • neutrino: oscillation
  • neutrino: sterile
  • space-time: higher-dimensional
  • space-time: fluctuation
  • resonance: energy
  • neutrino: path length
  • membrane model
  • nuclear physics