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Abstract: In extra-dimensional scenarios oscillations between active and sterileneutrinos can be governed by a new resonance in the oscillation amplitude. Thisresonance results when cancelation occurs between two phase differences, theusual kinematic one coming from the neutrino mass-squared difference, and ageometric one coming from the difference in travel times of the sterileneutrino through the bulk relative to the active neutrino confined to thebrane. In this work we introduce a specific metric for the brane-bulk system,from which we explicitly derive extra-dimensional geodesics for the sterileneutrino, and ultimately the oscillation probability of the active-steriletwo-state system. We find that for an asymmetrically-warped metric, theresonance condition involves both the neutrino energy E and the travel distanceL on the brane. In other words, the resonant energy may be viewed asbaseline-dependent. We show that to a good approximation, the resonancecondition is not on E or on L, but rather on the product LE. The model is richin implications, including the possibility of multiple solutions to theresonance condition, with ramifications for existing data sets, e.g., LSND andMiniBooNE. Some phenomenology with these brane-bulk resonances is discussed.



Autor: Sebastian Hollenberg, Octavian Micu, Heinrich Päs, Thomas J. Weiler

Fuente: https://arxiv.org/







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